Upbeat
Part of speech: noun
Definition: An unaccented beat at the start of a musical phrase.
Part of speech: adjective
Definition: Having a fast pace, tempo, or beat. Having a positive, lively, or perky tone, attitude, etc.
Example sentence: I've always been reasonably upbeat about most things.
Offbeat
Part of speech: adjective
Definition: Unusual, unconventional, not ordinary.
Part of speech: noun
Definition: The beats not normally accented in a measure.An unconventional person, someone who does not follow the beat, who chooses not to conform.
Example sentence: I have worried about getting pigeon-holed, but now I think I've done enough weird, offbeat stuff not to be. And I also know that I do things for the right reasons: I've made my money, so I don't have to say yes to anything.