Synonyms of implausible

Adjective

1. implausible (vs. plausible), improbable, unbelievable, unconvincing, unlikely, incredible#1, unbelievable

usage: having a quality that provokes disbelief; "gave the teacher an implausible excuse"

2. farfetched, implausible, unlikely (vs. likely)

usage: highly imaginative but unlikely; "a farfetched excuse"; "an implausible explanation"

Definition and meaning of implausible (Dictionary)