The Collaborative International Dictionary of English v.0.48:

hearing-impaired \hearing-impaired\ adj.
   having a hearing impairment making hearing difficult; having
   a defective but functioning sense of hearing.

   Syn: hard-of-hearing.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

hearing-impaired
    adj 1: having a hearing loss [syn: hard-of-hearing, hearing-
           impaired]