The Collaborative International Dictionary of English v.0.48:

Rumple \Rum"ple\, v. t. & i. [imp. & p. p. Rumpled p. pr. &
   vb. n. Rumpling.] [Cf. rimple, and D. rimpelen to wrinkle,
   rompelig rough, uneven, G. r["u]mpfen to wrinkle, MHG.
   r["u]mphen, OHG. rimpfan, Gr. "ra`mfos the crooked beak of
   birds of prey, ? to roam.]
   To make uneven; to form into irregular inequalities; to
   wrinkle; to crumple; as, to rumple an apron or a cravat.
   [1913 Webster]

         They would not give a dog's ear of their most rumpled
         and ragged Scotch paper for twenty of your fairest
         assignats.                               --Burke.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rumpled \Rum"pled\, a.
   Wrinkled; crumpled. --Pope.
   [1913 Webster]

WordNet (r) 3.0 (2006):

rumpled
    adj 1: in disarray; extremely disorderly; "her clothing was
           disheveled"; "powder-smeared and frowzled"; "a rumpled
           unmade bed"; "a bed with tousled sheets"; "his brown hair
           was tousled, thick, and curly"- Al Spiers [syn:
           disheveled, dishevelled, frowzled, rumpled,
           tousled]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "rumpled":
   cockled, cockly, corrugate, corrugated, creased, crimped, crimpy,
   crinkled, crinkly, crumpled, disheveled, furrowed, knitted,
   knotted, matted, messed up, mussed up, puckered, puckery, pursed,
   pursy, ridged, rimpled, rippled, rucked, ruffled, rugged, rugose,
   rugous, shaggy, snaggy, snarled, tousled, tously, tumbled,
   uncombed, wrinkled, wrinkly