Antonyms of adj improbable

3 senses of improbable

Sense 1
improbable (vs. probable), unlikely -- (not likely to be true or to occur or to have occurred; "legislation on the question is highly unlikely"; "an improbable event")

probable (vs. improbable), likely -- (likely but not certain to be or become true or real; "a likely result"; "he foresaw a probable loss")
        => equiprobable -- (equally probable)
        => presumptive -- (having a reasonable basis for belief or acceptance; "the presumptive heir (or heir apparent)")
        => verisimilar -- (appearing to be true or real; "a verisimilar tale")

Sense 2
improbable, unbelievable, unconvincing, unlikely -- (having a probability too low to inspire belief)

INDIRECT (VIA implausible) -> plausible -- (apparently reasonable and valid, and truthful; "a plausible excuse")

Sense 3
improbable, marvelous, marvellous, tall (prenominal) -- (too improbable to admit of belief; "a tall story")

INDIRECT (VIA incredible) -> credible, believable -- (capable of being believed; "completely credible testimony"; "credible information")

Similarity of adj improbable

3 senses of improbable

Sense 1
improbable (vs. probable), unlikely -- (not likely to be true or to occur or to have occurred; "legislation on the question is highly unlikely"; "an improbable event")
       => supposed (prenominal) -- (mistakenly believed; "the supposed existence of ghosts")

Sense 2
improbable, unbelievable, unconvincing, unlikely -- (having a probability too low to inspire belief)
       => implausible (vs. plausible) -- (having a quality that provokes disbelief; "gave the teacher an implausible excuse")

Sense 3
improbable, marvelous, marvellous, tall (prenominal) -- (too improbable to admit of belief; "a tall story")
       => incredible (vs. credible), unbelievable -- (beyond belief or understanding; "at incredible speed"; "the book's plot is simply incredible")