Webster's Revised Unabridged Dictionary · 1913

Incredulous

Incredulous (?; 135) , adjective

[Latin incredulus. See In- not, and Credulous.]

1.
Not credulous; indisposed to admit or accept that which is related as true, skeptical; unbelieving. — Bacon
A fantastical incredulous fool. — Bp. Wilkins
2.
Indicating, or caused by, disbelief or incredulity.
An incredulous smile. — Longfellow
3.
Incredible; not easy to be believed. [Rare] — Shakespeare