Definition of "thoughtless"

thoughtless

/ˈθɔːtləs/

adjective
comparative more thoughtless, superlative most thoughtless
1. Marked by or showing lack of due thought or care; careless.
2. Inconsiderate, inattentive.
3. Lacking thought or consideration.
  Quotations
  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.
  1886, Peter Christen Asbjørnsen, translated by H.L. Brækstad, Folk and Fairy Tales, page 281