1) Become mussed 2) Cause wrinkles 3) Crease 4) Crush into wrinkles 5) Disarrange 6) Disturb the smoothness of 7) Make unkempt 8) Make wrinkly 9) Mess up 10) Muss 11) Muss up 12) Opposite of smooth 13) Ruffle 14) Ruffle up 15) To muss 16) To tousle Found on https://www.crosswordclues.com/clue/rumple
• (n.) A fold or plait; a wrinkle. • (v. t. & i.) To make uneven; to form into irregular inequalities; to wrinkle; to crumple; as, to rumple an apron or a cravat. Found on http://thinkexist.com/dictionary/meaning/rumple/
Rum'ple transitive verb & i. [ imperfect & past participle Rumpled present participle & verbal noun Rumpling ] [ Confer rimple , and Dutch rimpelen to wrinkle, rompelig rough, uneven, German rümpfen to wrink... Found on http://www.encyclo.co.uk/webster/R/104