1. 讲不通：unconvertible 不能变换的 | unconvincing 讲不通 | uncooked 未煮过的

2. 没有说服力的：convenient 方便的 | unconvincing 没有说服力的 | culture 文化

3. 不令人信服的;难以置信的：Ambitious 雄心壮志的、野心勃勃的 | Unconvincing不令人信服的;难以置信的 | Arrogant傲慢的;自大的;自负的

adj

1. not convincing

    e.g. unconvincing argument
           as unconvincing as a forced smile

    Synonym: flimsy

2. having a probability too low to inspire belief

    Synonym: improbableunbelievableunlikely