Synonyms of unprincipled

Adjective

1. unprincipled (vs. principled), unscrupulous

usage: lacking principles or moral scruples; "freedom from coarse unprincipled calumny"- A.E.Stevenson

2. unprincipled, dishonorable (vs. honorable), dishonourable

usage: having little or no integrity

Definition and meaning of unprincipled (Dictionary)