The Collaborative International Dictionary of English v.0.48:

Unendowed \Unendowed\
   See endowed.

WordNet (r) 3.0 (2006):

unendowed
    adj 1: not equipped or provided; "unendowed with genius"-
           J.L.Lowes [ant: endowed]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "unendowed":
   amateurish, incapable, incapable of, incompetent, ineffective,
   inefficient, inept, inferior, semiskilled, unable, unable to,
   unaccomplished, unbusinesslike, uncoached, unfinished, unfit,
   unfitted, ungifted, uninitiated, unpolished, unprepared, unprimed,
   unprofessional, unqualified, unschooled, unskilled, untalented,
   untaught, untrained, untutored