The Collaborative International Dictionary of English v.0.48:

Unloving \Unloving\
   See loving.

WordNet (r) 3.0 (2006):

unloving
    adj 1: not giving or reciprocating affection [ant: loving]

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "unloving":
   affectless, anesthetized, arctic, autistic, blunt, catatonic,
   chill, chilly, cold, cold as charity, cold-blooded, coldhearted,
   cool, disagreeable, dispassionate, drugged, dull, emotionally dead,
   emotionless, frigid, frosted, frosty, frozen, heartless, icy, ill,
   immovable, impassible, impassive, inexcitable, inhospitable,
   insusceptible, nonemotional, objective, obtuse, out of touch,
   passionless, self-absorbed, soulless, spiritless, unaffectionate,
   unamiable, unbenign, unbenignant, uncompassionate, uncompassioned,
   uncordial, unemotional, unfeeling, ungenial, ungracious,
   unimpassioned, unimpressionable, unkind, unkindly, unpassionate,
   unresponding, unresponsive, unsusceptible, unsympathetic,
   unsympathizing, untouchable