Adjacent Words

Harmful definitions

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Webster's 1828 Dictionary

H`ARMFUL, a. Hurtful; injurious; noxious; detrimental; mischievous.
The earth brought forth fruit and food for man, without any mixture of harmful quality.

WordNet (r) 3.0 (2005)

adj
1: causing or capable of causing harm; "too much sun is harmful to the skin"; "harmful effects of smoking" [ant: harmless]

Merriam Webster's

adjective Date: 14th century of a kind likely to be damaging ; injurious • harmfully adverb • harmfulness noun

Oxford Reference Dictionary

adj. causing or likely to cause harm. Derivatives: harmfully adv. harmfulness n.

Webster's 1913 Dictionary

Harmful Harm"ful, a. Full of harm; injurious; hurtful; mischievous. `` Most harmful hazards.'' --Strype. --Harm"ful*ly, adv. -- Harm"ful*ness, n.

Collin's Cobuild Dictionary

Something that is harmful has a bad effect on something else, especially on a person's health. ...the harmful effects of smoking... It believed the affair was potentially harmful to British aviation. = damaging ? harmless ADJ: oft ADJ to n

Soule's Dictionary of English Synonyms

a. Injurious, detrimental, mischievous, pernicious, deleterious, noxious, baneful, prejudicial, disadvantageous, hurtful.

Moby Thesaurus

adverse, antagonistic, bad, bad for, baleful, baneful, bitchy, conflicting, contaminated, contrary, corroding, corrosive, corrupting, corruptive, counter, counteractive, counterproductive, cussed, damaging, dangerous, deadly, deleterious, destructive, detrimental, difficult, disadvantageous, disserviceable, distressing, evil, foul, hard, hateful, hazardous, hostile, hurtful, ill, in opposition, inimical, iniquitous, injurious, insalubrious, insanitary, invidious, lethal, malefic, maleficent, malevolent, malicious, malign, malignant, mean, mischievous, miserable, morbific, nasty, noisome, not easy, noxious, ominous, opposed, opposing, opposite, ornery, pathogenic, peccant, pernicious, pestiferous, poisonous, polluted, prejudicial, rigorous, risky, scatheful, septic, sinister, stressful, tainted, toxic, troublesome, troublous, trying, unadvantageous, unfavorable, unhealthful, unhealthy, unhygienic, unprofitable, unrewarding, unsafe, unsanitary, untoward, unwholesome, useless, venenate, veneniferous, venenous, venomous, vicious, virulent, wicked, worthless, wretched