'upbeat' definitions:

Definition of 'upbeat'

From: WordNet
adjective
Pleasantly (even unrealistically) optimistic [syn: cheerful, pollyannaish, upbeat]
noun
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]
noun
An unaccented beat (especially the last beat of a measure) [syn: upbeat, offbeat]