adjective
Ill-advised is an adjective that describes something that is not wise or prudent.
adverb
Ill-advised can also be used as an adverb to describe an action that was done without good judgment.
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It was ill-advised for the company to make such a risky investment without proper research.
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It was pretty ill-advised of him to try and fix the car without any experience.
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That was a totally ill-advised move, dude.
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Jumping into the project without a plan was ill-advised and ended up causing more harm than good.