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thoughtless (adj.)

1610s, "heedless, imprudent," from thought + -less. Meaning "inconsiderate of others" is from 1794. Related: Thoughtlessly; thoughtlessness.

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Definitions of thoughtless from WordNet

thoughtless (adj.)
showing lack of careful thought;
the debate turned into thoughtless bickering
thoughtless (adj.)
without care or thought for others; "the thoughtless saying of a great princess on being informed that the people had no bread; `Let them eat cake'";
Synonyms: uncaring / unthinking
From wordnet.princeton.edu