The Collaborative International Dictionary of English v.0.48:

Unrequested \Unrequested\
   See requested.

WordNet (r) 3.0 (2006):

unrequested
    adj 1: not requested; "the merchandise was unrequested" [ant:
           requested]

Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "unrequested":
   arbitrary, autonomous, discretional, discretionary, elective, free,
   free will, gratuitous, independent, nonmandatory, offered,
   optional, proffered, self-acting, self-active, self-determined,
   self-determining, spontaneous, unasked, unbesought, unbidden,
   uncalled-for, uncoerced, uncompelled, unforced, uninfluenced,
   uninvited, unpressured, unprompted, unrequired, unsolicited,
   unsought, voluntary, volunteer, willful