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harmful

[hahrm-fuh l] /ˈhɑrm fəl/
adjective
1.
causing or capable of causing harm; injurious:
a harmful idea; a harmful habit.
Origin
1000
before 1000; Middle English; Old English hearmful. See harm, -ful
Related forms
harmfully, adverb
harmfulness, noun
quasi-harmful, adjective
quasi-harmfully, adverb
unharmful, adjective
unharmfully, adverb
Synonyms
hurtful, detrimental, damaging, deleterious.
Antonyms
beneficial.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for harmfulness

harmful

/ˈhɑːmfʊl/
adjective
1.
causing or tending to cause harm; injurious
Derived Forms
harmfully, adverb
harmfulness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for harmfulness

harmful

adj.

mid-14c., from harm (n.) + -ful. Related: Harmfully.

Online Etymology Dictionary, © 2010 Douglas Harper
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19
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