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English word thoughtless comes from English -less (Lacking (something); without (something).), English thought.

Thoughtless etymology ?

Thoughtless detailed word origin explanation

Dictionary entryLanguageDefinition
-less English (eng) Lacking (something); without (something).
thought English (eng) (uncountable) The process by which such forms arise or are manipulated; thinking.. A way of thinking (associated with a group, nation or region).. Form created in the mind, rather than the forms perceived through the five senses; an instance of thinking.
thoughtless English (eng) Inconsiderate, inattentive.. Lacking thought or consideration.. Marked by or showing lack of due thought or care; careless.

Words with the same origin as thoughtless

Descendants of -less
breathless clueless countless defenseless fearless flawless hopeless meaningless merciless needless penniless pointless priceless regardless relentless ruthless selfless senseless sleepless timeless toothless topless useless wireless