unwise
UK: ʌnˈwaɪz | US: ʌnˈwaɪz
adj. lacking wisdom or good judgment; foolish
The word "unwise" combines the Old English prefix "un-" (meaning "not") with the adjective "wise" (from Old English "wīs," meaning "knowledgeable or prudent"). The prefix "un-" is a common Germanic negation marker, while "wise" traces back to Proto-Germanic *wīsaz, related to vision and knowledge. Together, they form a straightforward negation of wisdom, reflecting a lack of sound judgment.
It would be unwise to invest all your savings in a single risky venture.
She regretted her unwise decision to argue with the manager.
Driving in such heavy rain without headlights is unwise.
The king’s unwise policies led to widespread discontent.
He gave an unwise answer that cost him the debate.