WordNet (r) 3.0 (2006):
upbeat adj 1: pleasantly (even unrealistically) optimistic [syn: cheerful, pollyannaish, upbeat] n 1: a contented state of being happy and healthy and prosperous; "the town was finally on the upbeat after our recent troubles" [syn: wellbeing, well-being, welfare, upbeat, eudaemonia, eudaimonia] [ant: ill-being] 2: an unaccented beat (especially the last beat of a measure) [syn: upbeat, offbeat]