Word Type

Adjective

Adjective

The word "harmful" can be used as adjective and adjective.

Word Relationships

Opposites (Antonyms)

beneficial harmless harmless

Derived Terms

harmfully harmfulness nonharmful unharmful

Derived From

ful harm

Narrower Terms (Hyponyms)

baneful deadly insalubrious lethal malignant pernicious poisonous toxic unhealthful unhealthy unwholesome

Related Terms

disastrous harm

Related Terms

damaging destructive disadvantageous harm injurious malign noxious offensive painful toxic unwholesome

Similar Terms

abusive abusive bad bad bruising bruising calumniatory calumniatory calumnious catastrophic catastrophic counterproductive counterproductive damaging defamatory deleterious deleterious denigrating denigrative denigratory destructive detrimental disadvantageous hurtful ill ill injurious insidious libellous libelous malign mischievous mischievous nocent nocent noxious offensive painful pernicious pernicious prejudicial prejudicious prejudicious ruinous slanderous stabbing stabbing subtle toxic unfavorable unfavourable unwholesome wounding

Synonym Network

baneful damaging deleterious detrimental disadvantageous hurtful injurious mischievous noxious pernicious prejudicial

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.