Synonyms for harmful

Adjective

1. noxious (vs. innocuous), harmful, baneful, deadly, pernicious, pestilent, corrupting, degrading, vesicatory, vesicant, harmful, toxic, unwholesome

usage: injurious to physical or mental health; "noxious chemical wastes"; "noxious ideas"

2. harmful, dangerous (vs. safe), unsafe

usage: able or likely to do harm

3. harmful (vs. harmless), abusive, bad, bruising, calumniatory, calumnious, defamatory, denigrative, denigrating, denigratory, libellous, libelous, slanderous, catastrophic, ruinous, counterproductive, damaging, detrimental, prejudicial, prejudicious, ill, insidious, pernicious, subtle, mischievous, nocent, stabbing, traumatic, wounding, deleterious, hurtful, injurious, destructive, disadvantageous#1, harmful, malign, noxious#1, harmful, offensive, painful, toxic, unwholesome

usage: causing or capable of causing harm; "too much sun is harmful to the skin"; "harmful effects of smoking"

4. disadvantageous (vs. advantageous), harmful, minus, negative, inexpedient, harmful, inopportune

usage: constituting a disadvantage

5. adverse, harmful, inauspicious, untoward, unfavorable (vs. favorable), unfavourable

usage: contrary to your interests or welfare; "adverse circumstances"; "made a place for themselves under the most untoward conditions"

6. evil, harmful, injurious, malign (vs. benign)

usage: tending to cause great harm