implausible
adj. B2 Upper Intermediate US //ˌɪmˈpɫɔzəbəɫ// UK //ɪmplˈɔːzəbəl// im·plau·si·ble
adj. not likely to be true or possible. You use this to describe a story or an explanation that seems very strange or hard to believe.
adj. unlikely to be true or possible; not credible. Often used to describe narratives, arguments, or explanations that lack sufficient evidence or logical consistency.
The story of a giant rabbit is implausible.
The suspect's alibi was implausible because he claimed to be at a quiet library while the crime was happening in a busy city center.
While the theory provides a useful framework for understanding the data, the final conclusion remains implausible given the lack of supporting evidence from the field trials.
From im- + plausible.