upbeat
definition: pleasantly, even unrealistically, optimistic
example: They were always upbeat, even in difficult circumstances.
speech part: adjective
synonyms:
cheerful
definition: an unaccented beat (especially the last beat of a measure)
example:
speech part: noun
synonyms:
offbeat
definition: a contented state of being happy and healthy and prosperous
example: the town was finally on the upbeat after our recent troubles
speech part: noun
synonyms:
welfare