Definition of thoughtlessness:
- ingratitude (part of speech: noun)
- neglect (part of speech: noun)
inattention (part of speech: noun)
- lack of interest,
- rashness (part of speech: noun)
- thoughtlessness (part of speech: noun)
- recklessness (part of speech: noun)
- "The Deserted Woman", Honore de Balzac.
- "The Freedmen's Book", Lydia Maria Child.
- "The True Citizen, How To Become One", W. F. Markwick, D. D. and W. A. Smith, A. B..