4 syllables:
romanthony

3 syllables:
happily, fractiously, gallantly, thankfully, tapestry, axletree, phantasy, cabinetry, capably, scammony, apogee, chastity, nastily, blasphemy, sanity, craftily, cavity, rapidly, banditry, tragedy, balcony, rampantly, gascony, balmily, gravelly, captaincy, galaxy, travesty, fallacy, gravity, patchouli, nascency, stagnancy, damnably, laxity, bashfully, halfpenny, apathy, satiny, faculty, calumny, valiantly, valency, ataxy, abbacy, absently, antony, lazily, baptistery, atrophy, amnesty, majesty, callously, mangabey, maggoty, scantily, practically, anxiously, anomie, angrily, flashily, cadency, gallantry, agony, rhapsody, falconry, sassaby, agilely, scrappily, tangency, bankruptcy, passably, saxony, patently, tammany, gadgetry, fantasy, valiancy, malady, family, pageantry, handily, tastily, basketry, cannily, manfully, tactfully, alchemy, plangency, randomly, canopy, affably, manatee, cavalry, vanity, rackety, strategy, rascally, agassi, baptistry, cagily, chaplaincy, chattily, class musci, dapple-grey, dappled-grey, faddily, jaggedly, lambency, laughably, laxly, mccabe, natalie, pallidly, raggedly, ratafee, sacristy, scrabbly, tactlessly, tattily, wackily

4 syllables:
tonality, modality, casually, formality, vitality, unhappily, brutality, concavity, depravity, rationally, fugacity, casualty, actually, opacity, diastole, alacrity, sagacity, compatibly, mentality, catastrophe, audacity, mortality, anatomy, locality, nasality, substantially, naturally, vivacity, mammalogy, calamity, neutrality, edacity, frugality, legality, pugnacity, insanity, philately, totality, analogy, elaborately, disassembly, academy, type family, profanity, nationally, lethality, juglandaceae, rapacity, reality, anastrophe, capacity, normality, sodality, finality, carnality, philanthropy, morality, pulp cavity, examinee, salacity, voracity, financially, beech family, birch family, bird family, box family, chest cavity, dextrality, elm family, fern family, first balcony, fish family, flax family, form family, gourd family, grass family, heath family, hemp family, horse cavalry, inanity, loquacity, mark antony, mint family, moss family, palm family, pea family, pine family, pink family, plant family, rascality, rose family, rue family, rush family, sedge family, spurge family, tea family, unmanfully, urbanity, worm family, yam family, yew family

5 syllables:
sexuality, cordiality, perspicacity, triviality, understandably, actuality, factuality, unreality, criticality, abnormality, royal family, circumstantially, incapacity, joviality, alismatidae, pertinacity, subnormality, geniality, satisfactorily, gross anatomy, liberality, nationality, practicality, commonality, hylobatidae, nasal cavity, inhumanity, irrationally, hospitality, underhandedly, animality, sensuality, spiral galaxy, oral cavity, generality, musicality, unnaturally, partiality, aloe family, arum family, aster family, balsam family, buckthorn family, buckwheat family, cactus family, caper family, carrot family, cleavage cavity, clinodactyly, corkwood family, corporeality, cypress family, daphne family, dogbane family, dogwood family, duckweed family, eelgrass family, foxglove family, french academy, fungus family, gentian family, ginger family, goosefoot family, grapevine family, grass tree family, holly family, horsetail family, incompatibly, in reality, iris family, irreality, ivy family, laurel family, legume family, lily family, linden family, logicality, loosestrife family, lower saxony, lyricality, madder family, mallow family, mammal family, mangrove family, maple family, mental faculty, milkweed family, mollusk family, mustard family, myrtle family, nettle family, nutmeg family, olive family, orchid family, pelvic cavity, pepper family, physicality, plantain family, pokeweed family, poppy family, primrose family, prodigality, redwood family, reptile family, rockrose family, second balcony, sense modality, sesquipedality, severality, sinistrality, solar gravity, spatiality, sumac family, temporality, touch modality, travel rapidly, typicality, upper balcony, verticality, walnut family, whimsicality, willow family, with formality

6 syllables:
asexuality, center of gravity, total depravity, araliaceae, infant mortality, tympanic cavity, incorporeality, pathetic fallacy, congeniality, specific gravity, unilaterally, bilaterality, universality, irrationality, spirituality, substantiality, amaranthaceae, nuclear family, centre of gravity, ambystomatidae, bisexuality, municipality, thoracic cavity, channel capacity, extended family, milky way galaxy, internationally, dimensionality, artificiality, aerophilately, air force academy, amaranth family, arrowroot family, arthropod family, as a formality, atypicality, banana family, begonia family, bellflower family, bodily cavity, buttercup family, carnation family, conjugal family, conviviality, cylindricality, cyrilla family, ebony family, ephemerality, essentiality, gooseberry family, horizontality, illiberality, illogicality, impracticality, magnolia family, mechanized cavalry, mental capacity, mistletoe family, mulberry family, naval academy, neuroanatomy, nonsensicality, orbital cavity, papaya family, peony family, pineapple family, plato's academy, plea of insanity, police academy, polytonality, potato family, potentiality, quassia family, reciprocality, seating capacity, sensory faculty, sesame family, tamarisk family, theatricality, tubular cavity, tupelo family, unsatisfactorily, untypicality, ununderstandably, uterine cavity, verbena family, violet family, winter's bark family, without formality

7 syllables:
segmentation cavity, superficiality, homosexuality, insubstantiality, immateriality, amniotic cavity, abdominal cavity, territoriality, confidentiality, virtual reality, amaryllis family, amphibian family, bacteria family, geranium family, honeysuckle family, inessentiality, mahogany family, oleaster family, one-dimensionality, psychosexuality, rhinoceros family, sexual morality, third-dimensionality, three-dimensionality, two-dimensionality, uncongeniality, valerian family, visual modality

8 syllables:
microscopic anatomy, military academy, auditory modality, electrical capacity, genetic abnormality, intracranial cavity, olfactory modality

9 syllables:
congenital abnormality