thoughtless

Marked by or showing lack of due forethought or care; careless: synonym: careless.

Inconsiderate of the feelings of others.

Lacking thought.

Devoid of or lacking capacity for thought.

Unthinking; heedless; careless; giddy.

Synonyms Heedless, Remiss, etc. (see negligent), regardless, inattentive, inconsiderate, unmindful, flighty, harebrained.

Lacking thought; careless; inconsiderate; rash.

Giddy; gay; dissipated.

Deficient in reasoning power; stupid; dull.

Marked by or showing lack of due thought or care; careless.