Contortion

(n.) A twisting; a writhing; wry motion; a twist; as, the contortion of the muscles of the face.

Thesaurus Entries

anamorphism, anamorphosis, asymmetry, buckle, crookedness, detorsion, deviation, disproportion, distortion, gnarl, imbalance, irregularity, knot, lopsidedness, quirk, screw, torsion, tortuosity, turn, twist, unsymmetry, warp, wrench, wrest, wring