thoughtless

adj

1. Marked by or showing lack of due thought or care.
2. Inconsiderate, inattentive.

   “A thoughtless remark.”

3. Lacking thought or consideration.

   “The debate turned into thoughtless bickering.”

   “In thoughtless and breathless fear I rushed forward to avoid this host of demons, but while flying thus still more frightful and distorted shapes appeared, and I fancied I felt their hands clutching me.”