The Collaborative International Dictionary of English v.0.48:

Unsolicited \Unsolicited\
   See solicited.

WordNet (r) 3.0 (2006):

unsolicited
    adj 1: not asked for; "unasked advice"; "unsolicited junk mail"
           [syn: unasked, unsolicited]

Moby Thesaurus II by Grady Ward, 1.0:

64 Moby Thesaurus words for "unsolicited":
   abandoned, arbitrary, autonomous, deserted, discretional,
   discretionary, disregarded, elective, free, free will, gratuitous,
   half-done, ignored, independent, laid aside, left undone, missed,
   neglected, nonmandatory, offered, omitted, optional, overlooked,
   passed by, passed over, passed up, pigeonholed, proffered,
   put aside, self-acting, self-active, self-determined,
   self-determining, shunted, sidelined, sidetracked, slighted,
   spontaneous, unasked, unattended to, unbesought, unbidden,
   uncalled-for, uncared-for, unchaperoned, uncoerced, uncompelled,
   unconsidered, undone, unforced, uninfluenced, uninvited,
   unlooked-for, unpressured, unprompted, unregarded, unrequested,
   unrequired, unsought, untended, unwatched, voluntary, volunteer,
   willful