Found 2 items, similar to tireless.
English → English (WordNet) Definition: tireless tireless adj 1: showing sustained enthusiastic action with unflagging vitality; “an indefatigable advocate of equal rights”; “a tireless worker”; “unflagging pursuit of excellence” [syn: indefatigable, unflagging, unwearying] 2: characterized by hard work and perseverance [syn: hardworking, industrious, untiring]
English → English (gcide) Definition: Tireless Tireless \Tire"less\, a. Untiring. [1913 Webster]