Usually means: Acting without consideration or care.
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We found 27 dictionaries that define the word Thoughtless:

General (25 matching dictionaries)
  1. thoughtless: Longman Dictionary of Contemporary English
  2. thoughtless: Merriam-Webster
  3. thoughtless: Oxford Learner's Dictionaries
  4. thoughtless: American Heritage Dictionary of the English Language
  5. thoughtless: Collins English Dictionary
  6. thoughtless: Vocabulary.com
  7. Thoughtless, thoughtless: Wordnik
  8. thoughtless: Cambridge Advanced Learner's Dictionary
  9. thoughtless: Wiktionary
  10. thoughtless: Webster's New World College Dictionary, 4th Ed.
  11. thoughtless: The Wordsmyth English Dictionary-Thesaurus
  12. thoughtless: Infoplease Dictionary
  13. thoughtless: Dictionary.com
  14. thoughtless: Cambridge Essential American English Dictionary
  15. Thoughtless (Doris Day song), Thoughtless: Wikipedia, the Free Encyclopedia
  16. Thoughtless: Online Plain Text English Dictionary
  17. thoughtless: Webster's Revised Unabridged, 1913 Edition
  18. thoughtless: Rhymezone
  19. thoughtless: AllWords.com Multi-Lingual Dictionary
  20. thoughtless: Webster's 1828 Dictionary
  21. thoughtless: FreeDictionary.org
  22. thoughtless: Mnemonic Dictionary
  23. thoughtless: TheFreeDictionary.com

Business (1 matching dictionary)
  1. thoughtless: Legal dictionary

Slang (1 matching dictionary)
  1. thoughtless: Urban Dictionary

(Note: See thoughtlessly as well.)

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Definitions from Wiktionary (thoughtless)

▸ adjective:  Marked by or showing lack of due thought or care.
▸ adjective:  Inconsiderate, inattentive.
▸ adjective:  Lacking thought or consideration.

Similar:
uncaring, careless, unthoughtful, inconsiderate, indifferent, regardless, heedless, unthinking, unheeding, unreflective, more...

Opposite:
thoughtful, considerate, careful, attentive, deliberate

Types:
thoughtful, more...

Phrases:
uncaring thoughtless, socially thoughtless, a thoughtless person, thoughtless in speech, thoughtless pride, more...

Adjectives:
little, same, mere, more, dreadful, elder, own, ignorant, pure, best, incorrigibly



▸ Words similar to Thoughtless

▸ Usage examples for Thoughtless

▸ Idioms related to Thoughtless

▸ Wikipedia articles (New!)

▸ Popular nouns described by Thoughtless

▸ Words that often appear near Thoughtless

▸ Rhymes of Thoughtless

▸ Invented words related to Thoughtless

Similar:
uncaring, careless, unthoughtful, inconsiderate, indifferent, regardless, heedless, unthinking, unheeding, unreflective, more...

Opposite:
thoughtful, considerate, careful, attentive, deliberate

Types:
thoughtful, more...

Phrases:
uncaring thoughtless, socially thoughtless, a thoughtless person, thoughtless in speech, thoughtless pride, more...

Adjectives:
little, same, mere, more, dreadful, elder, own, ignorant, pure, best, incorrigibly



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