unbelievable

(a) beyond belief or understanding
- at incredible speed
- the book's plot is simply incredible
incredible,
(s) having a probability too low to inspire belief improbable, unconvincing, unlikely,

Synonyms

incredible improbable unconvincing unlikely

Antonyms

believable credible

See also

implausible incredulous unconvincing flimsy unthinkable

Words of close approximity

unbelievably

unbelievably