Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

pliancy, pliability; sequacity†, malleability; ductility, tractility†; extendibility, extensibility; plasticity; inelasticity, flaccidity, laxity. penetrability. clay, wax, butter, dough, pudding; alumina, argil; cushion, pillow, feather bed, down, padding, wadding; foam. mollification; softening &c v.. V. render soft &c adj.; soften, mollify, mellow, relax, temper; mash, knead, squash. bend, yield, relent, relax, give. plasticize'. Adj. soft, tender, supple; pliant, pliable; flexible, flexile; lithe, lithesome; lissom, limber, plastic; ductile; tractile†, tractable; malleable, extensile, sequacious†, inelastic; aluminous†; remollient†. yielding &c v.; flabby, limp, flimsy. doughy, spongy, penetrable, foamy, cushiony†. flaccid, flocculent, downy; edematous, oedematous†, medullary [Anat.], argillaceous, mellow. soft as butter, soft as down, soft as silk; yielding as wax, tender as chicken.