Synonyms for Roughen:

n.

atomize, bake, boil, boil over, break down, bubble, clear, cloud, boil away, boil up.

v.

derange (verb)
agitate, blur, botch, capsize, churn, clutter, confound, confuse, convulse, derange, disarrange, discompose, dishevel, dislocate, disorder, disorganize, displace, disturb, ferment, hash, jumble, meddle, mess, mislay, misplace, muddle, muss, perturb, ripple, roil, ruffle, rummage, rumple, scatter, scramble, swirl, tamper, toss, tousle, trouble, tumble, upset, whip, whisk, mix up.
harden (verb)
coarsen.
roughen (verb)
coarsen, gnarl, scratch, scuff.

Other synonyms:

harden
coarsen.

Usage examples for roughen

  1. We were all convinced that the unforeseen event might turn into a perilous one, should a wind arise to roughen the surface of the water. – By Water to the Columbian Exposition by Johanna S. Wisthaler
  2. With this long, sharp ovipositor the grasshopper can roughen the bark of twigs or make holes in the stems of plants or in the earth. – The Insect Folk by Margaret Warner Morley
  3. In iron clad Sometimes thy feature roughen to the sight, And oft transparent art thou seen in glass, Portending frangibility. – Tobacco; Its History, Varieties, Culture, Manufacture and Commerce by E. R. Billings