indiscretion; imprudence; misconduct
Refers to a lack of moral judgment or a specific improper act. Often used in formal or disciplinary contexts to describe behavior that goes against expected standards.
His indiscreet behavior became a problem.
The company dealt strictly with the employee's misconduct.
不謹慎 implies a lack of discretion or sensitivity to the situation, often in social contexts, whereas 不心得 is broader and can refer to any morally questionable act.
imprudent person; misguided person
Compound of 不 (fu, 'not') and 心得 (kokoroe, 'knowledge, understanding, rules'). Literally 'without proper understanding', it came to mean a lapse in moral judgment or conduct.