The Collaborative International Dictionary of English v.0.48:

Unfelt \Unfelt\
   See felt.

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "unfelt":
   asleep, benumbed, callous, dead, deadened, dull, impassible,
   imperceptive, impercipient, insensate, insensible, insensitive,
   insentient, numb, numbed, obdurate, obtuse, thick-skinned,
   thick-witted, unfeeling, unperceptive