from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Having no adverse effect; harmless.
  • adj. Not likely to offend or provoke to strong emotion; insipid.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Harmless; producing no ill effect.
  • adj. Inoffensive; unprovocative; not exceptional.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Harmless; producing no ill effect.

from The Century Dictionary and Cyclopedia

  • Harmless; producing no ill effect; incapable of harm or mischief.
  • Specifically In herpetology, not venomous.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. not causing disapproval
  • adj. not injurious to physical or mental health
  • adj. lacking intent or capacity to injure


From Latin innocuus : in-, not; see in-1 + nocuus, harmful (from nocēre, to harm; see nek-1 in Indo-European roots).
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin innocuus ("harmless"). (Wiktionary)



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  • 'Harmlos' TOP 5 BASIC

    S: Harmless, Inoffensive, Unprovocative

    A: Harmful, Damaging, Hurtful, Injurious

    ** Nocere -> lat.

    October 25, 2013

  • I was surprised that innocuous had survived from Latin but nocuous had not, when a friend suggested that it had, but was "noxious" instead. Interesting drift.

    October 28, 2007