thoughtless

thoughtless is an   Adjective

Definition:

[1] Lacking thought; careless; inconsiderate; rash; as, a thoughtless person, or act.

[2] Giddy; gay; dissipated. [R.] 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.

Synonyms: