Source : Webster's Revised Unabridged Dictionary (1913)

Unattached \Un`at*tached"\, a.
   1. Not attached; not adhering; having no engagement; free.

   2. (Mil.) Not assigned to any company or regiment.

   3. (Law) Not taken or arrested. --R. Junius.

Source : WordNet®

unattached
     adj 1: not fastened together
     2: not associated in an exclusive sexual relationship [syn: {uncommitted}]
        [ant: {attached}]
     3: (of animals) able to swim about; not attached [syn: {free-swimming}]