noun
Neutral term for a woman who is married. Can be used in general statements or descriptions.
彼女は人妻ですが、仕事も続けています。
She is a married woman, but she continues to work.
noun
someone else's wife; another man's wife
Often used when referring to a married woman in relation to someone other than her husband, sometimes with a nuance of unavailability or taboo.
彼は人妻に恋をしてしまった。
He fell in love with another man's wife.