Thought″less, adv. 1. Lacking thought; careless; inconsiderate; rash; as, a thoughtless person, or act.
2. Giddy; gay; dissipated. Johnson.
3. Deficient in reasoning power; stupid; dull.
Thoughtless as monarch oaks that shade the plain. Dryden.
— Thought″less‐ly, adv. — Thought″less‐ness, n.