from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Marked by or showing lack of due forethought or care; careless: synonym: careless.
  • adjective Inconsiderate of the feelings of others.
  • adjective Lacking thought.

from The Century Dictionary.

  • Devoid of or lacking capacity for thought.
  • Unthinking; heedless; careless; giddy.
  • Synonyms Heedless, Remiss, etc. (see negligent), regardless, inattentive, inconsiderate, unmindful, flighty, harebrained.

from the GNU version of the Collaborative International Dictionary of English.

  • adverb Lacking thought; careless; inconsiderate; rash.
  • adverb rare Giddy; gay; dissipated.
  • adverb Deficient in reasoning power; stupid; dull.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Marked by or showing lack of due thought or care; careless.
  • adjective Inconsiderate, inattentive.
  • adjective Lacking thought or consideration.

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

  • adjective without care or thought for others
  • adjective showing lack of careful thought


from Wiktionary, Creative Commons Attribution/Share-Alike License

thought +‎ -less


Help support Wordnik (and make this page ad-free) by adopting the word thoughtless.



Log in or sign up to get involved in the conversation. It's quick and easy.