[單字] uncertain與vague

[monicae (螽禽閒俗)]

做到一題單字題，對這兩個字無法分辨，想問這兩個字的差別?
題目如下：

Whenever anyone asks Colin about his job, he's always very ________ and never

gives a direct answer, so people end up not understanding what he does exactly.

(A) uncertain

(B) plain

(C) vague

(D) concise

(E) precise

答案是vague，想問為什麼在這個句子中uncertain為什麼不是答案?
謝謝大家

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推 thesecondone:我沒看答案時我也選A 錯了，建議去看英英字典的解釋
→ thesecondone:uncertain不會用在這種情況，而vague的解釋中有一意
→ thesecondone:為 not thinking or expressing one's thoughts
→ thesecondone:clearly or precisely.  很明顯的就是原句的意思
→ wadekimo:uncertain是不確定或者沒把握，和此文所要表達的意思不同
→ cerenis:講UNCERTAIN很像他也不知道自己在做什麼XD，VAGUE就是他表
→ cerenis:達的很模糊。
→ cerenis:若改成副詞或可用？HE DESCRIBES IT UNCERTAINLY？
→ DarkD:樓上那應該還是用vaguely，你那樣改跟本提選uncertain依樣
→ DarkD:意思
推 holoman:he is uncertain about how to describe his job
→ holoman:如果你要用uncertain的話
推 winska:事情 is uncertain!因為主詞是人所以用vague
→ monicae:原來如此~謝謝大家 :)
推 DennT:覺得原句有點避重就輕的意思，vague比uncertain更契合句意吧
→ sneak: clearly or  https://daxiv.com
→ sneak: 達的很模糊。 https://daxiv.com
→ muxiv: 若改成副詞或可用？HE https://muxiv.com