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late Old English, "twisted, crooked, wry," from Old Norse rangr, earlier *wrangr "crooked, wry, wrong," from Proto-Germanic *wrangaz (cf. Danish vrang "crooked, wrong," Middle Dutch wranc, Dutch wrang "sour, bitter," literally "that which distorts the mouth"), from PIE *wrengh- "to turn" (see wring).
Sense of "not right, bad, immoral, unjust" developed by c.1300. Wrong thus is etymologically a negative of right (from Latin rectus, literally "straight"). Latin pravus was literally "crooked," but most commonly "wrong, bad;" and other words for "crooked" also have meant "wrong" in Italian and Slavic. Cf. also French tort "wrong, injustice," from Latin tortus "twisted." Wrong-headed first recorded 1732. To get up on the wrong side (of the bed) "be in a bad mood" is recorded from 1801.
"that which is improper or unjust," c.1100, from wrong (adj.). Meaning "an unjust action" is recorded from c.1200.
"to do wrong to," early 14c., from wrong (adj.). Related: Wronged; wronging.