Usually means: Lack of consideration for others.
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We found 16 dictionaries that define the word thoughtlessness:

General (15 matching dictionaries)
  1. thoughtlessness: Merriam-Webster
  2. thoughtlessness: Oxford Learner's Dictionaries
  3. thoughtlessness: Collins English Dictionary
  4. thoughtlessness: Vocabulary.com
  5. thoughtlessness: Wordnik
  6. thoughtlessness: Cambridge Advanced Learner's Dictionary
  7. thoughtlessness: Wiktionary
  8. thoughtlessness: Rhymezone
  9. thoughtlessness: Webster's 1828 Dictionary
  10. thoughtlessness: FreeDictionary.org
  11. thoughtlessness: Mnemonic Dictionary
  12. thoughtlessness: TheFreeDictionary.com
  13. thoughtlessness: Dictionary.com

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

(Note: See thoughtless as well.)

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Definitions from Wiktionary (thoughtlessness)

▸ noun:  disregard for other's feelings
▸ noun:  heedless disregard for the consequences of one's actions

Similar:
inconsideration, unthoughtfulness, noncaring, indifference, uncaring, insouciance, regardlessness, unconcern, heartlessness, detachment, more...

Opposite:
thoughtfulness, consideration, deliberation, reflection

Types:
inconsideration, selfishness, rudeness, impoliteness, more...

Phrases:
hurting people with thoughtlessness, more...

Adjectives:
mere, own, such, sheer, utter, pure, much, childish, usual, youthful, happy



▸ Words similar to thoughtlessness

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▸ Idioms related to thoughtlessness

▸ Wikipedia articles (New!)

▸ Popular adjectives describing thoughtlessness

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▸ Rhymes of thoughtlessness

▸ Invented words related to thoughtlessness

Similar:
inconsideration, unthoughtfulness, noncaring, indifference, uncaring, insouciance, regardlessness, unconcern, heartlessness, detachment, more...

Opposite:
thoughtfulness, consideration, deliberation, reflection

Types:
inconsideration, selfishness, rudeness, impoliteness, more...

Phrases:
hurting people with thoughtlessness, more...

Adjectives:
mere, own, such, sheer, utter, pure, much, childish, usual, youthful, happy



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