upbeat

Noun · Adjective

WordNet 3.0

Noun (2)

1. a contented state of being happy and healthy and prosperous“the town was finally on the upbeat after our recent troubles”Synonyms: wellbeingwell-beingwelfareeudaemoniaeudaimonia
2. an unaccented beat (especially the last beat of a measure)Synonyms: offbeat

Adjective (1)

1. pleasantly (even unrealistically) optimisticSynonyms: cheerfulpollyannaish