居然 / 竟然 / 果然 / 果不其然jūrán / jìngrán / guǒrán / guǒbùqírán

Unexpectedly vs. As Expected: 居然 / 竟然 / 果然 / 果不其然

Meaning: Unexpectedly (居然/竟然) vs. Sure enough / Just as expected (果然/果不其然)

Pattern

These four expressions reflect the speaker's attitude toward an event that has occurred:
(1) "居然" (jūrán — unexpectedly / to think that): expresses strong surprise at something contrary to expectations, either positive (admiration) or negative (reproach/shock).
(2) "竟然" (jìngrán — unexpectedly): nearly synonymous with "居然", widely used in both speech and writing with a slightly milder tone of disbelief.
(3) "果然" (guǒrán — sure enough / as expected)

1
他居然在比赛中获得了第一名！
Tā jūrán zài bǐsài zhōng huòdéle dì yī míng!
He actually won first place in the competition!
2
我没想到他竟然会撒谎。
Wǒ méi xiǎngdào tā jìngrán huì sāhuǎng.
I never expected that he would actually tell a lie.
3
天气预报说会下雨，果然下了。
Tiānqì yùbào shuō huì xià yǔ, guǒrán xiàle.
The weather forecast said it would rain, and sure enough it rained.
4

•居然 / 竟然 = contrary to expectation (surprising); 果然 / 果不其然 = matching prior expectation.

⚠️ Common Mistakes:

•Using 果然 for an unexpected outcome: use 居然 or 竟然 instead.

•Using 居然 when the outcome matches predictions: use 果然 instead.

•Embedding 果不其然 tightly between subject and verb: it normally stands at the start or end of a clause separated by a comma.

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