- not credulous; disinclined or indisposed to believe; skeptical.
- indicating or showing unbelief: an incredulous smile.
- (often foll by of) not prepared or willing to believe (something); unbelieving
“unbelieving,” 1570s, from Latin incredulus “unbelieving, incredulous,” from in- “not” (see in- (1)) + credulus (see credulous). Formerly also of religious beliefs. Related: Incredulously; incredulousness.