3 syllables:
density, tensity

4 syllables:
dimensity, extensity, flux density, high-density, immensity, intensity, low-density, low density, perpensity, protensity

5 syllables:
change intensity, double-density, field intensity, half-intensity, teledensity, vapor density

6 syllables:
hyperintensity, radiodensity, relative density

7 syllables:
magnetic flux density, magnetic intensity

3 syllables:
devisee, registry, entity, jestingly, levity, ethnically, dentistry, emily, lenity, effigy, helsinki, pleadingly, negligee, deviltry, legibly, self-pity, chemistry, selfishly, enmity, astheny, el misti, evenki, hellishly, pettishly, prelacy, sceptically, skeptically, temptingly, threateningly, yenisey

4 syllables:
integrity, aesthetically, technically, expensively, domestically, extensively, successively, ethically, coquettishly, yosemite, devilishly, selectively, aggressively, affectingly, refreshingly, indemnity, hygienically, objectively, professedly, identity, effectively, expressively, necessity, attentively, celebrity, offensively, complexity, collectedly, respectively, dementedly, genetically, distressingly, protectively, authentically, impressively, dejectedly, obscenity, subjectively, esthetically, defensively, excessively, progressively, collectively, deceptively, symmetrically, frenetically, obsessively, suggestively, unendingly, unethically, unselfishly

5 syllables:
infidelity, overwhelmingly, comprehensively, pathetically, apprehensively, unexpectedly, hypothetically, imperceptibly, academically, geometrically, condescendingly, ineffectively, act reflexively, anti-semite, asymmetrically, empathetically, inattentively, inexpensively, inexpressively, inoffensively, kinaesthetically, kinesthetically, move reflexively, reprehensively, unimpressively, unrelentingly, unsymmetrically

6 syllables:
theoretically, sympathetically, argumentatively, die unexpectedly, noncomprehensively, unenergetically, unsympathetically