tiring /ˈtaɪəɹɪŋ/noun 2adjective 1forms 3 noun2 •The action of tiring. •Bits of bone and tough organic material from a corpse given to hawks to abate their hunger. adjective1 •That tires or tire.Carrying my bags up four flights of stairs is very tiring. formstirings · more tiring · most tiring