If you describe something such as an argument or explanation as unconvincing, you find it difficult to believe because it does not seem real.
例句
Mr Patel phoned the University for an explanation, and he was given the usual unconvincing excuses...帕特爾先生致電大學要求對方作出解釋，但只得到了一些無關痛癢的慣用托詞。To many readers it sounded unconvincing.在很多讀者看來，這很難令人信服。
ADJ-GRADED
（故事或人物）不可信的，不真實的
If you describe a story or a character in a story as unconvincing, you think they do not seem likely or real.