Scabrous

adjective

1. Covered with scales or scabs; hence, very coarse or rough.

   "After the incident with the gasoline, Noel’s burnt arm remained scabrous, and was susceptible to infections."

2. Disgusting, repellent.

   "The novel was a flagrantly scabrous bodice-ripper, and Rachael was ashamed to read it in public."

3. Of music, writing, etc.: lacking refinement; unmelodious, unmusical.
4. Difficult, thorny, troublesome.
5. Covered with a crust of dirt or grime.