not exactly informal 非正式

not at all

并不；根本不

that too was not exactly convincing.

那也根本不能讓人心悅誠(chéng)服。

not quite but close to being

不完全

not exactly agitated, but disturbed.

不說(shuō)是心急如焚，但有點(diǎn)心神不安。