causing or tending to cause harm; injurious
WordReference Random House Learner's Dictionary of American English © 2025
harm•ful /ˈhɑrmfəl/USA pronunciation
adj.
harm•ful•ness, n. [uncountable]
WordReference Random House Unabridged Dictionary of American English © 2025- causing or capable of causing harm.
harm•ful•ness, n. [uncountable]
harm•ful
(härm′fəl),USA pronunciation adj.
harm′ful•ly, adv.
harm′ful•ness, n.
- causing or capable of causing harm;
injurious:a harmful idea; a harmful habit.
- bef. 1000; Middle English; Old English hearmful. See harm, -ful
harm′ful•ness, n.
- hurtful, detrimental, damaging, deleterious.
- beneficial.
Collins Concise English Dictionary © HarperCollins Publishers::
'harmful' also found in these entries (note: many are not synonyms or translations):
Ful
- SPF
- VOC
- ablation
- abolish
- abolitionist
- abuse
- acid rain
- affected
- aggression
- anopheles
- antibiosis
- antidote
- avoid
- bad
- baleful
- baneful
- beneficial
- big business
- bioclean
- biocontainment
- black
- brush
- cacoethes
- collude
- compromised
- conspiracy
- conspiracy of silence
- conspire
- contagion
- contaminate
- corrosive
- crib-biting
- cross-contaminate
- damaging
- damnify
- decontaminate
- deleterious
- detox
- detrimental
- disease
- disinfect
- disinfectant
- disservice
- ecocide
- enemy
- evil
- evil-minded
- excrete
- fairy