The Collaborative International Dictionary of English v.0.48:

Unaided \Unaided\
   See aided.

WordNet (r) 3.0 (2006):

unaided
    adj 1: carried out without aid or assistance; "his first unaided
           walk through the park"

Moby Thesaurus II by Grady Ward, 1.0:

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   unescorted, unseconded, unsupported, withdrawn