Translation guide
How to express that something is not persuasive, believable, or fails to convince in Japanese.
Describing an argument, excuse, or explanation that lacks credibility or fails to persuade.
The most common and natural way to say something is unconvincing. Literally 'lacks persuasive power'.
His explanation was unconvincing.
That excuse is completely unconvincing.
Means 'cannot accept/be convinced'. Focuses on the listener's inability to be persuaded.
His argument is somehow unconvincing.
Idiomatic expression meaning 'doesn't sit right' or 'not fully convincing'. Slightly more subjective and emotional.
His story is somehow unconvincing.
Formal term meaning 'low credibility'. Used for evidence, data, or sources rather than everyday arguments.
This data is unconvincing (lacks credibility).
Describing acting, pretending, or a performance that fails to be believable.
Directly means 'bad acting'. Used when someone's performance or pretense is not believable.
His surprised act was unconvincing (bad acting).
Means 'forced', 'unnatural', or 'contrived'. Describes behavior that is obviously fake.
Colloquial term meaning 'smells like a lie' or 'obviously fake'. Stronger and more direct.
His excuse sounds unconvincing (like a lie).
Describing something that looks or seems fake, not genuine, or not up to standard.
Means 'to look inferior' or 'pale in comparison'. Can imply something is unconvincing compared to expectations.
It looks unconvincing compared to the real thing.
Casual adverb meaning 'not quite' or 'lacking something'. Can describe an unconvincing result or impression.
説得力がない focuses on the lack of persuasive power in the argument itself. 納得できない focuses on the listener's subjective inability to accept it. Use 説得力がない for objective criticism, 納得できない for personal feelings.
His explanation was unconvincing, but I accepted it.
There is no single adjective that directly translates 'unconvincing' in all contexts. Avoid using 非説得的 (hisettokuteki) as it is not natural Japanese. Use the phrases above depending on the situation.
Her smile was unconvincing (forced).
このデザインはいまいちだね。
This design is a bit unconvincing, isn't it?