c.1200, "devastate, ravage, ruin," from Anglo-French and Old North French waster "to spoil, ruin" (Old French guaster), altered (by influence of Frankish *wostjan) from Latin vastare "lay waste," from vastus "empty, desolate, waste" (see vain).
The word also existed in Old English as westan. Meaning "to lose strength or health; pine; weaken" is attested from c.1300; the sense of "squander, spend or consume uselessly" is first recorded mid-14c.; meaning "to kill" is from 1964. Wasted "intoxicated" is slang from 1950s. The adjective is recorded from late 13c.