foolish
UK: ˈfuːlɪʃ | US: ˈfuːlɪʃ
adj. lacking good sense or judgment; unwise
adj. trivial or silly; not serious
The word "foolish" derives from the noun "fool," which traces back to Old French "fol" (meaning "madman" or "jester") and Latin "follis" (literally "bellows," metaphorically "windbag" or "empty-headed person"). The suffix "-ish," of Germanic origin, is used to form adjectives indicating a characteristic or quality. Over time, "foolish" evolved to describe behavior resembling that of a fool—lacking wisdom or seriousness.
It was foolish to go hiking without proper gear in such weather.
She regretted her foolish decision to trust a stranger.
His foolish grin made it clear he wasn’t taking the situation seriously.
The children giggled at the foolish antics of the clown.
Investing all your savings in a risky scheme is simply foolish.