two ways to say 'unexpectedly' — neutral surprise vs incredulous surprise
HSK 4 reality check: 竟然 appears in real HSK 4 tests (see real-question section below). 居然 is HSK 5–6 vocabulary — it doesn't appear in the official HSK 4 wordlist or in the 12 mock exams in this archive. But textbooks teach the pair together because 居然 is one of the first "near-synonyms with a different feel" learners encounter once they leave HSK 4 — and the distinction is the kind of nuance HSK 5 starts to test.
Core Comparison / 对比
竟然 jìngrán
居然 jūrán
Core meaning
Surprisingly, unexpectedly — neutral surprise
Surprisingly, unexpectedly — stronger, often disbelief or judgment
Speaker stance
Reports the surprise
Reacts emotionally — disbelief, irony, or amazement
Register
Written and spoken; works in essays and news
More colloquial; common in spoken complaints / amazed comments
HSK level
Tested at HSK 4 (Test 05 Q57, Test 10 Q51)
HSK 5–6 vocabulary — appears in supplementary materials, not the HSK 4 core word list
Position
Subject + 竟然 + V (also after 没想到)
Subject + 居然 + V (also after 没想到) — same slot
When to Pick Which / 五种典型语境
Both work in most "surprise" sentences. These five contexts make the choice less arbitrary.
Context 1 — 竟然
没想到 + 竟然 — classic HSK 4 collocation
没想到他竟然通过了考试！ I didn't expect he'd actually pass!
没想到 already marks surprise; 竟然 reinforces it neutrally. This is the form HSK 4 tests (Test 05 Q57).
Context 2 — 竟然
Written / factual surprise
研究结果竟然与我们的猜测完全相反。 The research result was the exact opposite of our guess.
In essays, news, or reports, 竟然 is the unmarked choice. 居然 sounds too colloquial.
Context 3 — 居然
Complaint / accusation — strong reaction
你居然把我的生日忘了！ You actually forgot my birthday!
When the surprise carries irritation, hurt, or judgment, 居然 fits better. 竟然 here would sound too detached.
Context 4 — 居然
Disbelief — "How could it be?"
这么简单的事，他居然做不好。 Such a simple thing, and he couldn't do it well.
When the result violates what "should" happen, 居然 layers in incredulity. 竟然 works but is flatter.
Context 5 — either works
Pleasant surprise — neutral retelling
他竟然 / 居然还记得我的名字。 He actually still remembers my name.
For ordinary "I was surprised that…" sentences, either is fine. On HSK 4, default to 竟然.
Examples / 例句
竟然: 他平时不学习，竟然考了第一名。
Tā píngshí bù xuéxí, jìngrán kǎo le dì-yī míng.
He doesn't normally study, but unexpectedly came first. (neutral report of surprise)
居然: 你居然敢这样跟我说话！
Nǐ jūrán gǎn zhèyàng gēn wǒ shuōhuà!
How dare you talk to me like this! (incredulous, emotional)
Quick rule: Both translate as 'unexpectedly / actually'. 竟然 reports the surprise (neutral). 居然 reacts to it — often with disbelief, irritation, or strong amazement. On HSK 4, the answer is almost always 竟然 because 居然 isn't in the core vocab. The distinction matters most when you encounter 居然 in reading or want to use it in writing.
⚠ Common Errors / 常见错误
❌ 既然他通过了考试！(wrong word — 既然 means "since")
✓ 他竟然通过了考试！(surprise)
❌ 竟然你！(adverb can't lead)
✓ 你竟然/居然… (must follow subject)
❌ 我很高兴，他竟然来了。 (mismatched tone)
✓ 我很高兴，没想到他竟然来了。 (add 没想到 to license the surprise)
❌ 你居然敢…，太好了！(居然 + positive evaluation jars)
✓ 你居然敢…！(use 居然 only when the reaction is strong)
❌ 这本书竟然便宜。 (no surprise trigger)
✓ 没想到这本书竟然这么便宜。 (surprise needs a baseline expectation)
竟然/居然 only make sense when the result contradicts an expectation. If there's no expectation set up in context, the sentence sounds incomplete — add 没想到 or contrast the result with what "should" have happened.
💡 Why English speakers struggle with this pair
English uses tone of voice and context to mark "unexpected" feelings ("He actually showed up?!" vs "He actually showed up."). The same English word, different prosody, completely different feel. Chinese does the work in the vocabulary instead — neutral surprise is 竟然, charged surprise is 居然. Your ear isn't trained to listen for the choice because in English the choice doesn't exist. The fix is to ask, before producing the sentence: what's my stance — am I just reporting, or am I reacting? Reporting → 竟然. Reacting → 居然.
Fill in the Blank / 填空练习
Type the correct word to complete each sentence. Press Enter or click Check.
这么简单的问题，他回答不出来。
Neutral surprise at unexpected difficulty — 竟然 is the HSK 4 default.
你骗我！我再也不相信你了。
Strong emotional outburst (betrayal, anger) → 居然 captures the disbelief.
她本来只是抱着试试的态度，没想到得了第一名。
Direct from Test 05 Q57 — 没想到 + 竟然 is the classic HSK 4 collocation.
研究结果和我们最初的预测完全相反。
Written/academic context — neutral report of an unexpected finding. 竟然 is the unmarked formal choice; 居然 would sound too colloquial in a research statement.
我等了他两个小时，他连个电话都没打！
Complaint with strong emotional charge (waited two hours, no call) → 居然 fits the irritation better than 竟然.
这个孩子才五岁，能认识这么多汉字。
Positive surprise at a small child's ability — neutral marvelling, no judgment. 竟然 is the natural HSK 4 choice.
这么明显的错误，老板没发现，真是奇怪。
"这么明显的…竟然/居然没…" — when the result violates what should obviously have happened, 居然 layers in the speaker's disbelief. 竟然 also works but is flatter.
Quick Quiz / 小测验
天气预报说今天会下雨，结果一滴雨也没下。
Neutral 'unexpectedly didn't rain' — reporting the surprise without strong emotion. 竟然 is the HSK 4 default; 居然 would also be acceptable but adds incredulous tone.
你把我的生日忘了，太过分了！
Strong emotional reaction (accusation, anger) → 居然 fits better. 竟然 would sound too detached for a complaint.
我没想到他一个人完成了这么难的任务。
After 没想到, both work, but 竟然 is the HSK 4-tested choice (compare Test 05 Q57). 居然 would be slightly more colloquial.
实验数据显示气温下降了三度，与预测不符。
Formal scientific writing — neutral surprise at an anomalous result. 竟然 fits the register; 居然 would inject inappropriate emotion into a research statement.
说好了一起去，你自己先走了，太不够意思了！
Complaint to a friend with strong feeling (太不够意思了 confirms the irritation) → 居然 matches the tone. 竟然 would sound too detached for a personal grievance.
竟然 in Real HSK 4 / 真题示例
竟然 appears in two of the 12 mock exams. 居然 does not appear at all — confirming it's HSK 5+ territory. Both 竟然 contexts below show the same neutral-surprise tone:
A 没想到竟然得了第一名 B 她本来只是抱着试试的态度去参加比赛 C 这让她又吃惊又高兴 Correct order: BAC
没想到竟然… is one of the most common HSK 4 surprise constructions. Notice that clause C confirms the surprise (又吃惊又高兴) — that's the kind of neutral retelling 竟然 fits. If the writer had wanted to layer in disapproval, 居然 would have been more natural.
The blank itself takes 完全 (here: "completely the same"), but the stem shows 竟然 working in spoken dialogue — pleasant surprise at the coincidence. Notice the speaker says 呀 (informal interjection) and 竟然 still fits: it's neutral enough for everyday conversation, not just essays.
⚠ Common learner mistake
Don't substitute 居然 in either of the above. In Test 05 Q57, the writer is reporting a pleasant outcome — 居然 would suggest the speaker was judging the winner, which doesn't fit the "又吃惊又高兴" tone. In Test 10 Q51, the speakers are friendly strangers — 居然 would introduce an oddly intense reaction to a coincidence.
竟然 vs 居然 FAQ
Is 居然 actually tested on HSK 4?
No. 居然 is not in the official HSK 4 vocabulary list, and it doesn't appear in any of the 12 mock exams archived on this site. 竟然 does appear (Test 05 Q57 in 排列顺序, and in the stem of Test 10 Q51). Treat 居然 as an HSK 5–6 word that's worth recognizing when reading, but you won't need to produce it for HSK 4.
Are 竟然 and 居然 interchangeable?
Often yes — in pure "I'm surprised that…" sentences, either works. The asymmetric cases: (1) Formal writing prefers 竟然; (2) Strong emotional reactions (complaints, accusations, disbelief) prefer 居然; (3) Neutral retelling of a factual surprise prefers 竟然. They occupy the same grammatical slot (subject + ADV + V), so swapping is grammatical even when stylistically off.
How do I remember which carries stronger emotion?
Mnemonic: 居 ("to reside, to occupy") evokes someone planting themselves in a position — 居然 plants a strong stance. 竟 ("to finish, in the end") evokes a calm summing-up — 竟然 just delivers the verdict. So 居然 = stance, 竟然 = report. (Not etymologically rigorous, but it sticks.)
What's the difference vs 既然?
既然 (jìrán) is a different word entirely — it means "since / given that" and introduces a known premise, not a surprise. The trap is purely phonetic: jì-rán vs jìng-rán differ by one final consonant. See the 既然 vs 竟然 page for that comparison.
Can 竟然 / 居然 mean something positive?
Yes — both can mark pleasant surprise too, despite their disbelief overtones. "他竟然记得我的生日" ("he actually remembered my birthday") is positive. The English "actually" captures the same dual use. Polarity comes from context, not the adverb itself.
