unconvincing
adj. 令人难以信服的，令人怀疑的，不真实的
例句
I find the characters in the book very unconvincing.
我觉得书中的人物很不真实。
《牛津词典》
She managed a weak, unconvincing smile.
她勉强挤出一丝笑意。
This kind of evidence is philosophically unconvincing.
这类证据在哲学上是不足为信的。
