4 syllables:
comirnaty, eternity, fraternity, internity, maternity, modernity, paternaty, paternity

5 syllables:
coeternity, compaternity, confraternity, diuturnity, eviternity, preeternity, sempiternity, taciturnity

6 syllables:
to your eternity

3 syllables:
garnishee, turgidly, scarcity, garlicky, yearningly, torpidly, sparsity, concernedly, varsity, cursedly, learnedly, mortgagee, markedly, churlishly, furtively, guardedly, artistry, sordidly, perfidy, sportingly, argosy, artfully, artlessly, burgundy, carefully, carelessly, carnegie, carpentry, certainly, certainty, cheerfully, cheerlessly, chirpily, circuitry, cordially, courtesy, dirtily, dormancy, earnestly, earthnut pea, fearfully, fearlessly, fervency, fervently, fervidly, forcefully, forcibly, formally, fort-lamy, germany, gorgeously, harlotry, harmfully, harmlessly, harmony, heartily, jerkily, larceny, marquetry, mirthfully, nervelessly, nervily, normalcy, normally, normandie, normandy, partially, perfectly, perkily, personally, pharmacy, purposely, scornfully, servilely, smarmily, stormily, tardily, thirstily, tirelessly, urgency, urgently, verdancy, verdandi, wordily, wordlessly

4 syllables:
imperfectly, discursively, discourtesy, mercifully, adversity, infirmity, diversity, accordingly, lethargically, surgically, assertively, abnormalcy, absorbency, absurdity, advertency, advertently, basse-normandie, commercially, conformity, conservancy, convergency, conversancy, cryptorchidy, deformity, deservedly, detergency, determinedly, discordantly, disharmony, divergency, east germany, emergency, enormity, enormously, eternally, externally, grand larceny, haute-normandie, hyperbole, importantly, infernally, informally, insurgency, internally, in harmony, maternally, mysteriously, observably, observantly, perversity, proportionally, remarkably, remorsefully, remorselessly, reportedly, transversally, uncertainly, uncertainty, white burgundy, with courtesy

5 syllables:
andrew carnegie, controversially, inadvertency, inadvertently, lower-normandy, most importantly, nonabsorbency, nonconformity, petit larceny, petty larceny, undeservedly, uniformity, universally, university, unremarkably, upper-normandy

6 syllables:
biodiversity, counterinsurgency, musical harmony, nonuniformity, uncontroversially, yale university

7 syllables:
cambridge university, city university, harvard university, oxford university, princeton university, stanford university

10 syllables:
federal republic of germany