harmful
American Heritage Dictionary:
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harm·ful
(härm'fəl) 
adj.
Causing or capable of causing harm; injurious.
harmfully harm'ful·ly adv.
harmfulness harm'ful·ness n.
adj.
Causing or capable of causing harm; injurious.
harmfully harm'ful·ly adv.
harmfulness harm'ful·ness n.
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harmful
Roget's Thesaurus:
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harmful
adjective
- Causing harm or injury: bad, deleterious, detrimental, evil, hurtful, ill, injurious, mischievous. See help/harm/harmless.
Antonyms by Answers.com:
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harmful
adj
Definition: injurious, hurtful
Antonyms: aiding, assisting, helpful, nice, unharmful
Word Tutor:
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harmful
IN BRIEF: adj. - Constituting a disadvantage; Causing or capable of causing injury; Injurious to physical or mental health adj. - Tending to cause great injury; Contrary to your interests or welfare.
Inhumanity is harmful in every age.
— Cicero
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Copyrights:
American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Roget's Thesaurus
Roget's II: The New Thesaurus, Third Edition by the Editors of the American Heritage® Dictionary Copyright © 1995 byHoughton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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