The Collaborative International Dictionary of English v.0.48:

Unassisted \Unassisted\
   See assisted.

WordNet (r) 3.0 (2006):

unassisted
    adj 1: unsupported by other people [syn: single-handed,
           unassisted, unbacked]
    2: lacking help [ant: aided, assisted]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "unassisted":
   alienated, alone, aloof, apart, companionless, detached,
   friendless, homeless, insular, isolated, kithless, lone, lonely,
   lonesome, removed, rootless, separate, separated, single-handed,
   solitary, solo, unabetted, unaccompanied, unaided, unattended,
   unescorted, unseconded, unsupported, withdrawn