harmful

[ hahrm-fuhl ]
See synonyms for harmful on Thesaurus.com
adjective
  1. causing or capable of causing harm; injurious: a harmful idea;a harmful habit.

Origin of harmful

1
First recorded before 1000; Middle English; Old English hearmful; see harm, -ful

Other words for harmful

Opposites for harmful

Other words from harmful

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

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use harmful in a sentence

British Dictionary definitions for harmful

harmful

/ (ˈhɑːmfʊl) /


adjective
  1. causing or tending to cause harm; injurious

Derived forms of harmful

  • 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