2 syllables:
thessaly

3 syllables:
severally, splendidly, pleasantly, messily, tendency, ebony, pedigree, credibly, gemini, venally, leprosy, prelacy, lengthily, elegy, readily, tenantry, weaponry, helplessly, equity, zestfully, remedy, breathlessly, brevity, revelry, flexibly, melody, steadily, entity, jealousy, restfully, enemy, seventy, entropy, tensity, peasantry, clemency, velvety, threnody, sensibly, devilry, chemistry, pedantry, pregnancy, legacy, bestially, cecity, necropsy, sesame, zealotry, mentally, density, dreadfully, helpfully, testily, specially, embassy, tenancy, pleasantry, centrally, kennedy, deputy, secondly, enmity, legatee, felony, preciously, recipe, ecstasy, especially, debauchee, specialty, presently, destiny, heavily, heavenly, medically, endlessly, empathy, jealously, chemically, penalty, astheny, dentistry, devilishly, effigy, el misti, emily, ethically, ethnically, evenki, hellishly, helsinki, jestingly, levity, negligee, pettishly, registry, sceptically, selfishly, skeptically, technically, temptingly, threateningly, yenisey

4 syllables:
theosophy, incessantly, rebelliously, transcendency, detestably, acceptably, resplendently, extremity, ascendancy, nonentity, mastectomy, expectancy, identity, necessity, dependably, lamentably, successfully, inequity, discrepancy, sequentially, unsteadily, lobectomy, ascendency, preferably, serenity, fidelity, unpleasantly, nephrectomy, potentially, death penalty, tremendously, essentially, flux density, desperately, schenectady, lumpectomy, intrepidly, ostensibly, sententiously, complexity, splenectomy, insensibly, telemetry, respectfully, respectably, hegemony, generally, inflexibly, dependency, supremacy, anemone, longevity, repentantly, ineffably, perplexity, vasectomy, resplendency, solemnity, contemptuously, amenity, federally, intensity, heredity, perceptibly, convexity, incredibly, integrity, allegedly, indemnity, incessancy, separately, telepathy, licentiously, low density, regrettably, thrombectomy, tentatively, infectiously, penelope, aesthetically, affectingly, aggressively, attentively, authentically, celebrity, collectedly, collectively, coquettishly, deceptively, defensively, dejectedly, dementedly, distressingly, domestically, effectively, esthetically, excessively, expensively, expressively, extensively, frenetically, genetically, impressively, objectively, obscenity, obsessively, offensively, pathetically, progressively, propensity, protectively, refreshingly, respectively, selectively, subjectively, successively, suggestively, symmetrically, unendingly, unethically, unselfishly, yosemite

5 syllables:
tonsillectomy, orchidectomy, geochemistry, mask of pregnancy, hysterectomy, eventually, sympathectomy, life expectancy, sentimentally, exceptionally, consequentially, confederacy, biochemistry, accidentally, mastoidectomy, independently, tubal pregnancy, reverentially, oophorectomy, white supremacy, professionally, stapedectomy, orchiectomy, pneumonectomy, salpingectomy, thyroidectomy, disrespectfully, appendectomy, penitentially, irreverently, macrencephaly, abstemiously, rhytidectomy, incidentally, intemperately, open sesame, providentially, high fidelity, prostatectomy, unacceptably, deferentially, photochemistry, independency, conscientiously, embolectomy, microcephaly, fundamentally, vapor density, anencephaly, reprehensibly, unsuccessfully, academically, act reflexively, anti-semite, apprehensively, asymmetrically, comprehensively, condescendingly, empathetically, geometrically, hypothetically, imperceptibly, inattentively, ineffectively, inexpensively, inexpressively, infidelity, inoffensively, kinaesthetically, kinesthetically, move reflexively, overwhelmingly, reprehensively, sympathetically, theoretically, unexpectedly, unimpressively, unrelentingly, unsymmetrically

6 syllables:
cholecystectomy, unconventionally, coincidentally, biogeography, unintentionally, environmentally, radiochemistry, physical chemistry, simple mastectomy, impetuosity, manifest destiny, interdependency, electrochemistry, organic chemistry, cercopithecidae, experimentally, cosmetic dentistry, inconsequentially, adrenalectomy, immunochemistry, relative density, die unexpectedly, noncomprehensively, unenergetically, unsympathetically

7 syllables:
ovarian pregnancy, radical mastectomy, inorganic chemistry, magnetic flux density, paleogeography, abdominal pregnancy, total hysterectomy

8 syllables:
radical hysterectomy

10 syllables:
modified radical mastectomy