tired (adj.)

"to weary," also "to become weary," Old English teorian (Kentish tiorian) "to fail, cease; become weary; make weary, exhaust," of uncertain origin; according to Watkins possibly from Proto-Germanic *teuzon, from a suffixed form of PIE root *deu- (1) "to lack, be wanting." Related: Tired; tiring.

1550s, from tired + -ness.