01 adv. Lacking thought; careless; inconsiderate; rash; as, a thoughtless person, or act.
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1.
Lacking thought; careless; inconsiderate; rash; as, a thoughtless person, or act.
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2.
Giddy; gay; dissipated.[R.]
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3.
Deficient in reasoning power; stupid; dull.“Thoughtless as monarch oaks that shade the plain.” — Dryden.