upbeat

upbeat - English Dictionary

[ noun ]
■ an unaccented beat (especially the last beat of a measure)
→ offbeat

[ noun ]
■ a contented state of being happy and healthy and prosperous
e.g.)
・the town was finally on the upbeat after our recent troubles
→ eudaemonia , eudaimonia , welfare , well-being , wellbeing

[ adjective satellite ]
■ pleasantly (even unrealistically) optimistic
→ cheerful , pollyannaish