Antonyms of adj unbelievable

2 senses of unbelievable

Sense 1
incredible (vs. credible), unbelievable -- (beyond belief or understanding; "at incredible speed"; "the book's plot is simply incredible")


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")

Similarity of adj unbelievable

2 senses of unbelievable

Sense 1
incredible (vs. credible), unbelievable -- (beyond belief or understanding; "at incredible speed"; "the book's plot is simply incredible")
       => astounding, dumbfounding, dumfounding -- (bewildering or striking dumb with wonder)
       => fabulous -- (barely credible; "the fabulous endurance of a marathon runner")
       => improbable, marvelous, marvellous, tall (prenominal) -- (too improbable to admit of belief; "a tall story")
       => undreamed, undreamed of, undreamt, undreamt of, unimagined -- (not imagined even in a dream)
          Also See-> implausible#1; incredulous#1; unconvincing#1, flimsy#2; unthinkable#1

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")