不 可 一 世 bù kě yī shì : consider oneself unexcelled in the world; be insufferably arrogant

不 料 bù liào : unexpectedly; to one's surprise

不 期 然 而 然 bù qī rán ér rán : happen unexpectedly; turn out contrary to one's expectations

不 速 之 客 bù sù zhī kè : uninvited or unexpected guest

不 意 bù yì : unexpectedly; unawareness; unpreparedness

不 虞 bù yú : unexpected; eventuality; contingency; not worry about

出 乎 預 料 chū hū yù liào : unexpectedly

出 現 意 外 chū xiàn yì wài : (to appear) unexpected(ly)

遘 gòu : meet unexpectedly

Big5: , Unicode: 9058 (遘),
Links: MT, Cantonese, Ld, Chinese Language

覯 gòu : complete; meet unexpectedly; see

Big5: , Unicode: 89af (覯),
Links: MT, Cantonese, Ld, Chinese Language

逅 hòu : meet unexpectedly

Big5: , Unicode: 9005 (逅),
Links: MT, Cantonese, Ld, Chinese Language

竟 jìng : unexpectedly; actually; to go so far as to; indeed

Big5: , Unicode: 7adf (竟),
Links: MT, Cantonese, Ld, Chinese Language

竟 然 jìng rán : unexpectedly

儻 [傥] tǎng : if; unexpectedly

Big5: , Unicode: 513b (儻),
Links: MT, Cantonese, Ld, Chinese Language

突 然 tū rán : sudden; abrupt; unexpected

邂 xiè : meet unexpectedly

Big5: , Unicode: 9082 (邂),
Links: MT, Cantonese, Ld, Chinese Language

意 外 yì wài : unexpected

意 想 不 到 yì xiǎng bù dào : unexpected; previously unimagined