The Collaborative International Dictionary of English v.0.48:

Rugous \Ru"gous\, a. [Cf. F. rugueux.]
   Wrinkled; rugose.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "rugous":
   cockled, cockly, corrugate, corrugated, cragged, craggy, creased,
   crimped, crimpy, crinkled, crinkly, crumpled, furrowed, gravelly,
   harsh, ironbound, jagged, jaggy, knitted, knotted, puckered,
   puckery, pursed, pursy, ragged, ridged, rimpled, rippled,
   rockbound, rocky, rucked, rugged, rugose, rumpled, saw-toothed,
   sawtooth, scragged, scraggly, scraggy, serrate, serrated, snagged,
   snaggled, snaggy, stony, wrinkled, wrinkly