3 syllables:
-osity, cross city, docity, kaw city, osity, paucity, raucity

4 syllables:
aquosity, atrocity, bogosity, callosity, carnosity, crinosity, dinocity, eurocity, famosity, ferocity, fibrosity, fumosity, gemmosity, glebosity, globosity, gulosity, gummosity, lumosity, monstrosity, morbosity, morosity, mucosity, muscosity, neurocity, nodosity, pilosity, piosity, plumosity, pomposity, porosity, precocity, rimosity, rugosity, schistosity, serosity, spicosity, torosity, umbrosity, varicosity, velocity, ventosity, verbosity, villosity, viscosity, vivocity

5 syllables:
actuosity, amorosity, animosity, cariosity, curiosity, dubiosity, ebriosity, epulosity, flatuosity, flexuosity, foliosity, four-velocity, generosity, glandulosity, glutinosity, grandiosity, hideosity, high-velocity, imporosity, lachrymosity, monstruosity, mulierosity, nebulosity, numerosity, oleosity, operosity, otiosity, pendulosity, pluviosity, populosity, preciosity, radiosity, reciprocity, sabulosity, salebrosity, saporosity, scrupulosity, sensuosity, sinuosity, speciosity, tediosity, tenebrosity, tortuosity, travelocity, tuberosity, tumulosity, unctuosity, vaporosity, viciosity, virtuosity, vitiosity

6 syllables:
anfractuosity, caliginosity, defectuosity, escape velocity, fastidiosity, fuliginosity, hemizygosity, homozygosity, hypervelocity, hyperviscosity, impetuosity, incuriosity, inunctuosity, libidinosity, litigiosity, muzzle velocity, negotiosity, religiosity, ridiculosity, sententiosity, spirituosity, voluminosity

7 syllables:
absolute viscosity, dynamic viscosity, equinumerosity, heterozygosity, impecuniosity, overscrupulosity, terminal velocity, unit of viscosity

9 syllables:
coefficient of viscosity

2 syllables:
awfully

3 syllables:
solemnly, wantonly, cross-country, doggedly, naumachy, thoughtfully, naughtily, thoughtlessly, falsity, dogsbody, laudably, albany, cautiously, solvency, flawlessly, plausibly, wrongfully, caudally, myology, gaudily, saucily, caustically, chronically, comically, dohickey, dominie, frolicky, hominy, jollity, logically, mockingly, modishly, mombin tree, palmistry, snobbishly, suavity, topically, toppingly

4 syllables:
rheology, inaudibly, scatology, topology, cosmology, dishonestly, incautiously, necrology, unlawfully, androgyny, causality, exhaustively, illogically, ironically, laconically, lye hominy, methodically, pearl hominy, rhapsodically, sardonically, symbolically

5 syllables:
meritocracy, synentognathi, economically, electronically, patriotically, periodically, philosophically, psychologically, technologically, vitriolically

6 syllables:
ideologically, unpatriotically