If you are incredulous that means you can't or won't believe something. If you tell people about those aliens you met the other night, they'll probably give you an incredulous look.

Incredulous is the opposite of credulous, which means "believing too easily." Both words come from the Latin word credere, which means "to believe." Incredulous is stronger than skeptical; if you're incredulous of something, you refuse to believe it, but if you're skeptical, you're doubtful but you haven't ruled it out completely. If someone insists that your best friend is actually an underworld spy, you'll probably look at them with incredulous anger.

Definitions of incredulous

adj not disposed or willing to believe; unbelieving

incredible, unbelievable
beyond belief or understanding
disbelieving, sceptical, skeptical, unbelieving
denying or questioning the tenets of especially a religion
having or showing distrust
disposed to believe on little evidence
(a common but incorrect usage where `credulous' would be appropriate) credulous
too credulous for your own good
not inclined to ask questions
naif, naive
marked by or showing unaffected simplicity and lack of guile or worldly experience
trustful, trusting
inclined to believe or confide readily; full of trust
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