[なくてもよい;なくてもいい, nakutemoyoi ; nakutemoii](exp) (1) (after neg. stem of verb) need not (verb); (not) have to; expressing absence of obligation or necessity; (2) (See 無い) need not have; need not exist[Add to Longdo]
[おんをうる, onwouru](exp, v5r) to demand gratitude; to do something for someone in order to create an obligation of gratitude from that person[Add to Longdo]