Synonyms of unprincipled in English:

unprincipled


See definition of unprincipled

adjective

1‘he is an unprincipled opportunist’

SYNONYMS
immoral, unethical, unscrupulous, amoral, dishonourable, reprobate, dishonest, unprofessional, deceitful, devious, corrupt, corrupted, dissolute, underhand, crooked, bad, wicked, evil, villainous, roguish, shameless, sinful, ignoble, base, low, degenerate, sordid
archaic dastardly
ANTONYMS

principled, ethical