unconvincing

/ˌʌnkənˈvɪnsɪŋ/ 51
If you describe something such as an argument or explanation as unconvincing, you find it difficult to believe because it does not seem real. (论辩、解释等) 难以令人信服的

adjective [原级]令人难以信服的,令人怀疑的,不真实的

If you describe a story or a character in a story as unconvincing, you think they do not seem likely or real. (
故事或故事中的人物) 难以令人相信的•  ...an unconvincing love story.

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