upbeat

An unaccented beat or beats that occur before the first beat of a measure.

The upward stroke made by a conductor to indicate the beat that leads into a new measure.

Optimistic.

Happy; cheerful.

Having a fast pace, tempo, or beat.

Having a positive, lively, or perky tone, attitude, etc.

An unaccented beat at the start of a musical phrase.

pleasantly (even unrealistically) optimistic

an unaccented beat (especially the last beat of a measure)

a contented state of being happy and healthy and prosperous