"upbeat" in the noun sense
1. wellbeing, well-being, welfare, upbeat, eudaemonia, eudaimonia
a contented state of being happy and healthy and prosperous
"the town was finally on the upbeat after our recent troubles"
2. upbeat, offbeat
an unaccented beat (especially the last beat of a measure)
"upbeat" in the adjective sense
1. cheerful, pollyannaish, upbeat
pleasantly (even unrealistically) optimistic
Source: WordNet® (An amazing lexical database of English)
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