Dictionary:

uninvolved

  (ŭn'ĭn-vŏlvd')

Feeling or showing no interest or involvement; unconcerned: an uninvolved bystander.

adjective

1. Lacking interest in one's surroundings or worldly affairs: aloof, detached, disinterested, incurious, indifferent, unconcerned, uninterested. See attitude/good attitude/bad attitude/neutral attitude, concern/unconcern.
2. Not inclining toward or actively taking either side in a matter under dispute: impartial, neuter, neutral, nonaligned, nonpartisan, unbiased, uncommitted, unprejudiced. Idioms: on the fence. See fair/unfair.

The adjective has 2 meanings:

Meaning #1: not involved
  Antonym: involved (meaning #1)

Meaning #2: showing lack of emotional involvement
  Synonyms: degage, detached