sorry adj.

Middle English sore, from Old English sar "painful, grievous, aching, sad, wounding," influenced in meaning by Old Norse sarr "sore, wounded," from Proto-Germanic *sairaz "suffering, sick, ill" (source also of Old Frisian sar "painful," Middle Dutch seer, Dutch zeer "sore, ache," Old High German ser "painful," Gothic sair "pain, sorrow, travail"), which is perhaps from a PIE root *sai- "suffering" (source also of Old Irish saeth "pain, sickness"). Related: Sorely; soreness.

The slang meaning "angry, irritated" is recorded by 1738. Adverbial use, "painfully, so as to cause physical pain or injury" (as in sore afraid) is from Old English sare but has mostly died out (replaced by sorely), but adverbial use persists in the Modern German cognate sehr, the usual word for "very."

Middle English sorwe, from Old English sorg "grief, regret, trouble, care, pain, anxiety," from Proto-Germanic *sorg- (source also of Old Saxon sorga, Old Norse sorg, Middle Dutch sorghe, Dutch zorg, Old High German soraga, German sorge, Gothic saurga), perhaps from PIE *swergh- "to worry, be sick" (source also of Sanskrit surksati "cares for," Lithuanian sergu, sirgti "to be sick," Old Church Slavonic sraga "sickness," Old Irish serg "sickness"). Not considered to be connected etymologically with sore (adj.) or sorry.

"somewhat sorry," 1793; see sorry (adj.) + -ish.