Know anyone like this?

fatuous (fat·u·ous): / FACH oo uhs /
adjective

(1) unconsciously or complacently unintelligent, foolish, or inane; intentionally silly
(2) imaginary, unreal, or illusory (uncommon)

[From Latin fatuus meaning “foolish (,idiotic, silly).”]

Usage: I’ve been known to make fatuous remarks from time to time.