beatnik Definition

1. A young person with scruffy or unconventional clothes, long hair, unusual lifestyle, etc.

Thesaurus: Bohemian, rebel, radical, dropout, maverick, iconoclast, beat, (slang) hippie, long-hair.
2. In the 1950s and 60s: a member or follower of the beat generation, who rejected the accepted social and political ideas, etc of the time.