Translation guide
The English adjective 'convincing' describes something that makes you believe it is true or real. In Japanese, there is no single direct equivalent; instead, you choose expressions based on what is being described—an argument, a performance, evidence, or a person's manner.
His explanation was convincing.
Please give me a more convincing reason.
Means 'understandable and acceptable'. Used when you are personally convinced or satisfied with the logic.
His proposal was convincing (I could accept it).
Literally 'the logic runs through'. Emphasizes that the reasoning is coherent and logical.
His opinion is logical and convincing.
Describing a performance, act, or lie that seems real or genuine.
Literally 'approaches truth'. Used for performances or acting that feel real and convincing.
His acting was very convincing.
Means 'seems like the real thing'. Used for fake objects, lies, or performances that appear genuine.
His lie sounded convincing.
Borrowed from English 'reality'. Common in casual speech to say a story or performance feels real.
The CG in that movie is really convincing.
Describing evidence or data that strongly supports a conclusion.
Describing a person who speaks or presents in a way that makes others believe them.
Literally 'good at speaking'. Describes someone whose delivery is convincing.
He's so convincing when he speaks that everyone ends up agreeing.
Literally 'skilled mouth'. Can mean 'smooth-talking' or 'persuasive', but sometimes carries a nuance of being glib or insincere.
Can imply the person is a bit too smooth or manipulative.
説得力がある focuses on the objective power of the argument to persuade; 納得できる focuses on the listener's subjective acceptance. You can say 説得力はあるけど納得できない (It's persuasive but I'm not convinced).
The English word 'convincing' is often used as a simple adjective, but directly translating it as コンビンシングな is not natural Japanese. Always choose a phrase that fits the context.
That's a convincing argument.
She gave a very convincing performance.
We need more convincing evidence.
He's very convincing, so be careful not to be fooled.