sorrow (n.) Look up sorrow at Dictionary.com
Old English sorg "grief, regret, trouble, care," from Proto-Germanic *surgo (cf. Old Saxon sorga, Old Norse sorg, Middle Dutch sorghe, Dutch zorg, Old High German soraga, German sorge, Gothic saurga), perhaps from PIE *swergh- (cf. Sanskrit surksati "cares for," Lithuanian sergu "to be sick," Old Church Slavonic sraga "sickness," Old Irish serg "sickness"). The verb is Old English sorgian.