The Collaborative International Dictionary of English v.0.48:

Crumple \Crum"ple\ (kr[u^]m"p'l), v. t. [imp. & p. p. Crumpled
   (-p'ld); p. pr. & vb. n. Crumpling (-pl[i^]ng).] [Dim. fr.
   crump, a.]
   To draw or press into wrinkles or folds; to crush together;
   to rumple; as, to crumple paper.
   [1913 Webster]

         They crumpled it into all shapes, and diligently
         scanned every wrinkle that could be made. --Addison.
   [1913 Webster]

WordNet (r) 3.0 (2006):

crumpled
    adj 1: of metal e.g.; "bent nails"; "a car with a crumpled front
           end"; "dented fenders" [syn: bent, crumpled,
           dented]

Moby Thesaurus II by Grady Ward, 1.0:

69 Moby Thesaurus words for "crumpled":
   anamorphous, askew, asymmetric, bent, bowed, cockeyed, cockled,
   cockly, contorted, corrugate, corrugated, cragged, craggy, crazy,
   creased, crimped, crimpy, crinkled, crinkly, crooked, crunched,
   deviative, distorted, furrowed, gravelly, harsh, ironbound,
   irregular, jagged, jaggy, knitted, knotted, labyrinthine, lopsided,
   nonsymmetric, one-sided, puckered, puckery, pursed, pursy, ragged,
   ridged, rimpled, rippled, rockbound, rocky, rucked, rugged, rugose,
   rugous, rumpled, saw-toothed, sawtooth, scragged, scraggly,
   scraggy, serrate, serrated, snagged, snaggled, snaggy, sprung,
   stony, tortuous, twisted, unsymmetric, warped, wrinkled, wrinkly