upbeat

nouns

a contented state of being happy and healthy and prosperous
"the town was finally on the upbeat after our recent troubles"
eudaemonia, eudaimonia, upbeat, welfare, well-being, wellbeing
an unaccented beat (especially the last beat of a measure)
offbeat, upbeat

adjectives

pleasantly (even unrealistically) optimistic
cheerful, pollyannaish, upbeat