increíble
/inkɾeˈible/ · A1 · adj
incredible, unbelievable
in- (not) + creíble (believable, from creer) = not believable
Same Latin root as English incredible: in- (not) + credere (to believe). Spanish creer means to believe, creíble is believable, and in- flips it. Credit and creed share the root. Stress falls on the í: in-cre-Í-ble.