disengaged

Concise Oxford English Dictionary © 2008 Oxford University Press:
disengage /ˌdɪsɪnˈgeɪdʒ, ˌdɪsɛn-/

▶verb

• 1 separate, release, or detach.

  ■ (as adj. disengaged) emotionally detached; uninvolved.

• 2 remove (troops) from an area of conflict.

• 3 Fencing pass the point of one's sword over or under the opponent's sword to change the line of attack.

▶noun Fencing a disengaging movement.

– derivatives
disengagement noun.