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I was imprudent to place myself at such risk.
"Prudent" means careful or cautious; "imprudent" means risky or incautious. "Imprudent actions" are risky ones.
The imprudent man walked home.
It would be imprudent to ask a personal question during a class.
The word imprudent means being careless or acting unwisely.
His imprudent remarks about his boss cost him his job.
Building a full-scale model of an untested design would be imprudent.