na-adjective
misconduct; profligacy; licentiousness
Refers to improper behavior, especially of a moral or sexual nature. Often used in formal or literary contexts to describe a person's dissolute lifestyle.
彼は不身持ちな生活を送っている。
He leads a dissolute life.
不身持ちな行いが原因で、彼は会社
He was forced to resign from the company due to his misconduct.
放蕩 refers to dissipation and debauchery, often with a stronger connotation of self-indulgent pleasure-seeking, whereas 不身持ち is a broader term for improper conduct.
Compound of 不 (fu, 'not') + 身持ち (mimochi, 'conduct, behavior'). The reading ふみもち is a standard on'yomi-kun'yomi combination. The exact historical derivation is uncertain, but the term has been used since at least the Edo period to denote moral laxity.