THESAURUS
Spartan, Spartanic, acerb, acerbic, acid, acidulous, acrid, acrimonious, alum, amaroidal, ascetic, asperous, austere, authoritarian, biting, bitter, bitter as gall, brisk, caustic, clamp, coarse, collapsible, compactable, compressible, compressor, constrictor, constringent, consumptive, contractible, contractile, contractional, contractive, contractor, cutting, deflationary, demanding, double-edged, dour, edged, escharotic, exacting, exigent, fierce, foldable, grim, hard, harsh, incisive, inclement, irritating, keen, meticulous, mordacious, mordant, mortified, nose-tickling, penetrating, piercing, pincer, piquant, poignant, puckery, pungent, restorative, rigorous, roborant, rough, rugged, scathing, severe, sharp, sour, stabbing, stern, stinging, strict, strident, stringent, styptic, styptic pencil, tart, tough, trenchant, ungentle, unsparing, vehement, violent, virulent, vise, vitriolic
ROGET THESAURUS
Contraction
N
contraction, reduction, diminution, decrease of size, defalcation, decrement, lessening, shrinking, compaction, tabes, collapse, emaciation, attenuation, tabefaction, consumption, marasmus, atrophy, systole, neck, hourglass, condensation, compression, compactness, compendium, squeezing, strangulation, corrugation, astringency, astringents, sclerotics, contractility, compressibility, coarctation, inferiority in size, contracting, astringent, shrunk, contracted, strangulated, tabid, wizened, stunted, waning, neap, compact, unexpanded &c (expand), contractile, compressible, smaller &c (small).
Acridity
N
acridity, astringency, bite, tear gas, smoke, acrid fumes, acrid, biting, astringent, sharp, harsh, bitter, (5) Sound (i) SOUND IN GENERAL.