TO REGRET

Arabic 

ندم, اسف (grief, regret). (various references)

Chinese 

歉 (apologize, deficient), 懊 . (various references)

German

bereuen (repent, regret, rue), bedauern (regret, deplore, regretfulness). (various references)

Hungarian

sajnálkozik (to commiserate), sajnál (regret, to commiserate, to deplore), megbán (regret, repent, to rue). (various references)

Japanese Kanji 

惜しむ (to be frugal, to value), 悲しむ (to be sad, to mourn for). (various references)

Japanese Katakana 

おしむ (to be frugal, to value), おもいのこす, そばむ (to lean to one side, to look aside, to oppose), くいる, くやむ (to mourn, to repent), ざんねんである (to be sorry), かなしむ (to be sad, to mourn for). (various references)

Pig Latin

otay egretray.(various references)