The Collaborative International Dictionary of English v.0.48:

Scabrous \Sca"brous\, a. [L. scabrosus, fr. scaber rough: cf. F.
   scabreux.]
   1. Rough to the touch, like a file; having small raised dots,
      scales, or points; scabby; scurfy; scaly. --Arbuthnot.
      [1913 Webster]

   2. Fig.: Harsh; unmusical. [R.]
      [1913 Webster]

            His verse is scabrous and hobbling.   --Dryden.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "scabrous":
   asperous, bristly, craggy, downy, flaky, flocculent, furfuraceous,
   harsh, jagged, knobby, knotty, lentiginous, lepidote, off-color,
   prickly, racy, risky, risque, rugged, salty, scabby, scabious,
   scaly, scraggy, scurfy, spicy, squamous, suggestive, thorny,
   uneven, unlevel, unsmooth