hippie

Short definition from Wiktionary

Noun

1. 1
   A teenager who imitated the beatniks.
2. 2
   One who chooses not to conform to prevailing social norms: especially one who subscribes to values or actions such as acceptance or self-practice of recreational drug use, liberal or radical sexual mores, advocacy of communal living, strong pacifism or anti-war sentiment, etc.
3. 3
   A person who keeps an unkempt or sloppy appearance and has unusually long hair (for males), and is thus often stereotyped as a deadbeat.
4. 4
   Someone who dresses in a hippie style.
5. 5
   One who is hip.

Adjective

1. 1
   Of or pertaining to hippies.
2. 2
   Not conforming to generally accepted standards.