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We found 30 dictionaries with English definitions that include the word thoughtless:
Click on the first link on a line below to go directly to a page where "thoughtless" is defined.

General (28 matching dictionaries)

1. thoughtless: Merriam-Webster.com [home, info]
2. thoughtless: Oxford Dictionaries [home, info]
3. thoughtless: American Heritage Dictionary of the English Language [home, info]
4. thoughtless: Collins English Dictionary [home, info]
5. thoughtless: Vocabulary.com [home, info]
6. thoughtless: Macmillan Dictionary [home, info]
7. Thoughtless, thoughtless: Wordnik [home, info]
8. thoughtless: Cambridge Advanced Learner's Dictionary [home, info]
9. thoughtless: Wiktionary [home, info]
10. thoughtless: Webster's New World College Dictionary, 4th Ed. [home, info]
11. thoughtless: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. thoughtless: Infoplease Dictionary [home, info]
13. thoughtless: Dictionary.com [home, info]
14. thoughtless: UltraLingua English Dictionary [home, info]
15. thoughtless: Cambridge Dictionary of American English [home, info]
16. Thoughtless (Doris Day song), Thoughtless: Wikipedia, the Free Encyclopedia [home, info]
17. Thoughtless: Online Plain Text English Dictionary [home, info]
18. thoughtless: Webster's Revised Unabridged, 1913 Edition [home, info]
19. thoughtless: Rhymezone [home, info]
20. thoughtless: AllWords.com Multi-Lingual Dictionary [home, info]
21. thoughtless: Webster's 1828 Dictionary [home, info]
22. thoughtless: Free Dictionary [home, info]
23. thoughtless: Mnemonic Dictionary [home, info]
24. thoughtless: WordNet 1.7 Vocabulary Helper [home, info]
25. thoughtless: LookWAYup Translating Dictionary/Thesaurus [home, info]
26. thoughtless: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

27. thoughtless: Legal dictionary [home, info]

Slang (1 matching dictionary)

28. thoughtless: Urban Dictionary [home, info]

(Note: See thoughtlessness for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (thoughtless) ▸ adjective:  showing lack of careful thought ("The debate turned into thoughtless bickering") ▸ adjective:  without care or thought for others ("The thoughtless saying of a great princess on being informed that the people had no bread") ▸ adjective:  marked by or paying little heed or attention ▸ Also see thoughtlessness ▸ Words similar to thoughtless ▸ Usage examples for thoughtless ▸ Popular nouns described by thoughtless ▸ Words that often appear near thoughtless ▸ Rhymes of thoughtless ▸ Invented words related to thoughtless