differing from the usual or expected; unconventional: an offbeat comedian.
Music. an unaccented beat of a measure.
(music) any of the normally unaccented beats in a bar, such as the second and fourth beats in a bar of four-four time. They are stressed in most rock and some jazz and dance music, such as the bossa nova
unusual, unconventional, or eccentric (as noun): he liked the offbeat in fashion