ˈthȯtlə̇s adjective
1. : marked by absence of thought: as
a. : marked by failure to think before acting : careless , rash
the thoughtless victim of an unnecessary accident
b. : marked by failure to keep in mind : heedless
easy to fault them, to call them … thoughtless of tomorrow and God — A.B.Guthrie
c.
(1) : marked by a deficiency of thought : showing lack of intelligence : stupid
a thoughtless housing boom which contains the seeds of its own undoing — New Republic
(2) : devoid of thought : insensate
the thoughtless forces of nature — Bertrand Russell
d. : marked by lack of consideration for others : inconsiderate
is horribly thoughtless and seems to take a real delight in giving me pain — Oscar Wilde
2. archaic : free from trouble or care
every thoughtless nest — William Blake
• thought·less·ly adverb
• thought·less·ness noun -es