3 syllables:
clivity, privity

4 syllables:
acclivity, activity, captivity, clusivity, declivity, festivity, motivity, nativity, passivity, proclivity

5 syllables:
absorptivity, adaptivity, affectivity, aggressivity, agressivity, attractivity, coactivity, collectivity, conductivity, connectivity, corrosivity, creativity, deceptivity, destructivity, diffusivity, directivity, effectivity, emissivity, ergativity, erosivity, exclusivity, exhaustivity, expansivity, expressivity, impulsivity, inactivity, inclusivity, inductivity, infectivity, infestivity, instinctivity, intinctivity, negativity, normativity, objectivity, obsessivity, perceptivity, perfectivity, permittivity, perspectivity, proactivity, processivity, productivity, progressivity, projectivity, reactivity, receptivity, recessivity, recursivity, reflectivity, reflexivity, refractivity, regressivity, relativity, reluctivity, resistivity, responsivity, retentivity, selectivity, self-activity, sensitivity, sex activity, subjectivity, susceptivity, transitivity, transmissivity

6 syllables:
alternativity, bioactivity, business activity, commutativity, cooperativity, correlativity, cross-reactivity, generativity, human activity, hyperactivity, insensitivity, intempestivity, interactivity, interpassivity, intransitivity, overactivity, performativity, reproductivity, retroactivity, social activity, superactivity, underactivity, vasoactivity

7 syllables:
associativity, chemoreceptivity, chemosensitivity, commercial activity, evaporativity, impredicativity, incogitativity, intersubjectivity, offensive activity, oversensitivity, photoconductivity, pyroconductivity, radio-activity, radioactivity, regioselectivity, sensory activity, seronegativity, seropositivity, sexual activity, special relativity, subversive activity, superconductivity

8 syllables:
amatonormativity, anticommutativity, electroconductivity, electronegativity, general relativity, heteronormativity, immunoreactivity, intelligence activity, stereoselectivity, theory of relativity

9 syllables:
educational activity, enantioselectivity, human sexual activity

10 syllables:
extracurricular activity, special theory of relativity

11 syllables:
general theory of relativity

3 syllables:
gimmickry, whimsically, typically, filthily, fittingly, ministry, civilly, swimmingly, resignedly, trinity, imagery, hillbilly, principally, frigidly, trippingly, mimicry, wickedly, limpidly, impishly, willingly, rigidly, killingly, wittingly, realty, cliquishly, cryptically, dimity, fidgety, fishily, gibingly, lingeringly, pidlimdi, sickeningly

4 syllables:
exquisitely, sanguinity, tranquillity, terrifically, critically, vicinity, submissively, excitingly, befittingly, admittedly, plasticity, publicity, stability, tranquility, ethnicity, liquidity, motility, cupidity, spheniscidae, stupidity, putridity, derisively, affinity, sterility, benignity, fertility, complicity, ubiquity, scurrility, infinity, facility, linguistically, physically, simplicity, unwillingly, duplicity, cynically, lividity, obliquity, capriciously, puerility, vindictively, incisively, sublimity, humility, judiciously, specifically, unwittingly, validity, servility, lucidity, indistinctly, gentility, virginity, frigidity, mobility, tactility, iniquity, malignity, gracility, acridity, stolidity, convincingly, gravidity, assiduity, auspiciously, avidity, bewitchingly, flaccidity, forgivingly, long-windedly, pacifically, perniciously, placidity, sidesplittingly, tonicity, uncivilly, unthinkingly, viscidity

5 syllables:
juvenility, immobility, arability, anonymity, audibility, movability, tangibility, durability, indecisively, realistically, concentricity, volubility, notability, suitability, portability, intrinsically, palpability, sensibility, pliability, mutability, gullibility, solubility, synchronicity, disability, affability, infertility, imbecility, unconvincingly, sociability, politically, fallibility, curability, visibility, tractability, credibility, inability, multiplicity, instability, longanimity, risibility, plausibility, friability, readability, unanimity, serendipity, changeability, tenability, liability, edibility, equanimity, uncritically, culpability, authenticity, incivility, statistically, altruistically, atonicity, avariciously, bendability, breakability, egotistically, health facility, immotility, inauspiciously, injudiciously, magnanimity, meretriciously, pellucidity, pessimistically, provability, ratability, spinnability, squeezability, stainability, synonymity, taxability, unforgivingly

6 syllables:
admirability, compressibility, respectability, digestibility, variability, attainability, practicability, intangibility, irascibility, incredibility, predictability, tax liability, dependability, amicability, optimistically, separability, impalpability, antifertility, scientifically, inscrutability, profitability, suggestibility, impossibility, serviceability, infallibility, transferability, availability, permeability, convertibility, navigability, corruptibility, invincibility, transmutability, sustainability, accessibility, vulnerability, agreeability, insensibility, incurability, demonstrability, inflexibility, excitability, alterability, replaceability, characteristically, dissolubility, inaudibility, contemptibility, desirability, advisability, unrealistically, adorability, commutability, reversibility, incapability, immovability, penetrability, eligibility, intractability, infeasibility, insolubility, formidability, perdurability, manageability, illegibility, destructibility, immutability, amenability, comparability, improbability, perceptibility, conceivability, unsociability, impregnability, exchangeability, achievability, answerability, assailability, believability, delectability, discernability, dispensability, docking facility, inculpability, indictability, marriageability, measurability, noticeability, penal facility, perfectability, perfectibility, permissibility, rateability, transposability, unchangeability

7 syllables:
understandability, inadmissibility, inapplicability, incommutability, imperceptibility, intelligibility, incompatibility, impenetrability, inexorability, invariability, indigestibility, indestructibility, imperishability, associability, substitutability, unpredictability, interchangeability, invulnerability, quantifiability, ineligibility, maneuverability, irreversibility, inevitability, reproducibility, athletic facility, companionability, imperfectibility, impermeability, impermissibility, inadvisability, inconceivability, incorruptibility, indispensability, indomitability, indubitability, manipulability, unalterability, unavailability, uncharacteristically, undependability, undesirability, unexchangeability, unmalleability, unprofitability, unquestionability, unreliability, unrespectability

8 syllables:
incontrovertibility, limited liability, indefatigability, incomprehensibility, irreproducibility

9 syllables:
recreational facility