Synonyms: tall, marvellous, marvelous, improbable
Definition: too improbable to admit of belief
Usage: a tall story
Similar words: incredible, unbelievable
Definition: beyond belief or understanding
Usage: at incredible speed; the book's plot is simply incredible
Synonyms: improbable, unlikely
Definition: not likely to be true or to occur or to have occurred
Usage: legislation on the question is highly unlikely; an improbable event
Synonyms: improbable, unbelievable, unconvincing, unlikely
Definition: having a probability too low to inspire belief
Similar words: implausible
Definition: having a quality that provokes disbelief
Usage: gave the teacher an implausible excuse