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: Owen Wilson is an actor, but think of him as a sort of secret agent. He has an offbeat, indie-movie sensibility. Every so often, however, he infiltrates some big-budget movie he clearly doesn't belong in - 'Anaconda,' 'Armageddon,' 'The Haunting' - and struggles valiantly to stop it from sucking.
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 never went out to make the music that people would like. I mean, I tried, because every teenager tries to do that. But in my heart, I'd always come from gigs where I played upbeat guitar covers and I'd start writing sad songs on the piano.