harm·ful

[hahrm-fuhl]
adjective
causing or capable of causing harm; injurious: a harmful idea; a harmful habit.

Origin:
before 1000; Middle English; Old English hearmful. See harm, -ful

harm·ful·ly, adverb
harm·ful·ness, noun
qua·si-harm·ful, adjective
qua·si-harm·ful·ly, adverb
un·harm·ful, adjective
un·harm·ful·ly, adverb


hurtful, detrimental, damaging, deleterious.


beneficial.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To harmful
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World English Dictionary
harmful (ˈhɑːmfʊl) [Click for IPA pronunciation guide]
 
adj
causing or tending to cause harm; injurious
 
'harmfully
 
adv
 
'harmfulness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Harmful is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a fool or simpleton; ninny.
Example sentences
But some people think that any regulation at all could be harmful.
We've already learnt twice how harmful a war against other world power is for a
  country.
What the study does do, though, is add to the evidence that dieting is harmful.
Commercial oven cleaners can expose you to caustic chemicals and harmful toxins
  while reducing the air quality in your home.
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