Synonyms and Antonyms of harmless
not causing or being capable of causing injury or hurt
- a perfectly harmless little spider
healthful, healthy, salubrious, wholesome
benignant
sound, trustworthy
gentle, gracious, mild
nonthreatening, painless, unobjectionable
noncorrosive, nondestructive, nonfatal, noninfectious, nonlethal, nonpoisonous, nonpolluting, nontoxic, nonvenomous
poisonous, venomous
menacing, ominous, sinister, threatening
hazardous, imperiling (or imperilling), jeopardizing, parlous, perilous, risky, unsafe, unsound
nasty, noisome, unhealthful, unhealthy, unwholesome
offensive, painful, scathing, wounding
deadly, fatal, lethal, ruinous
destructive, insidious, malignant, noxious, pestilent, polluted, tainted
adverse, bad, baleful, baneful, damaging, dangerous, deleterious, detrimental, evil, harmful, hurtful, ill, injurious, mischievous, nocuous, noxious, pernicious, prejudicial, wicked
