Meaning: Having or showing no moral principles; not honest or fair.
Synonyms: unprincipled, unethical, immoral, conscienceless, untrustworthy, corrupt, corrupted, dishonest, fraudulent, cheating, dishonourable, deceitful, devious, cunning, furtive, sly, wrongdoing,
Examples: Unscrupulous landlords might be tempted to harass existing tenants