3 syllables:
metical, reticul, schetical, thetical

4 syllables:
aesthetical, ascetical, cosmetical, dinetical, emetical, esthetical, frenetical, genetical, heretical, hermetical, magnetical, noetical, pathetical, phonetical, phrenetical, poetical, prophetical, syndetical, synthetical, threnetical

5 syllables:
alphabetical, anchoretical, antithetical, apathetical, aporetical, arithmetical, catechetical, diabetical, dietetical, diuretical, energetical, epithetical, exegetical, geodetical, homiletical, hyperthetical, hypothetical, inergetical, masoretical, metathetical, nomothetical, omiletical, parenthetical, quodlibetical, strategetical, sympathetical, theoretical, unpoetical

6 syllables:
anachoretical, antiheretical, antipathetical, apologetical, atheoretical, biogenetical, cytogenetical, diaphoretical, epexegetical, epithumetical, hydrokinetical, logarithmetical, peripatetical, phytogenetical, set-theoretical

7 syllables:
abiogenetical

3 syllables:
pellicle, centrical, testicle, technical, denticle, ventricle, metrical, helical, despiteful, festival, plentiful, epical, segmental, medical, sceptical, vesicle, chemical, skeptical, ethnical, besprinkle, ethical, pedicel, aestival, bendable, credible, decimal, edental, edible, emmental, epochal, equable, estival, flexible, genital, getable, gettable, kettleful, legible, meltable, methanal, peccable, pedestal, pennoncel, pentacle, pessimal, preferable, rentable, requital, retinal, seconal, sectional, sellable, seminal, seneschal, sensible, sensual, sentinel, skeletal, spectacle, spendable, stretchable, tenable, tentacle, testable, vegetable, vegetal, vendable

4 syllables:
identical, electrical, angelical, nonsensical, appendicle, calendrical, directional, putrescible, obstetrical, symmetrical, alchemical, extendible, unethical, indelible, ereshkigal, acceptable, accessible, affectional, amenable, amendable, ascendable, church festival, collectable, collectible, commendable, compensable, compressible, conceptional, confessional, congenital, congressional, contemptible, contestable, conventional, correctable, correctional, defendable, defensible, delectable, dependable, detectable, detestable, digestible, dimensional, discretional, dispensable, electable, exceptional, execrable, expendable, expressible, extendable, extensible, forgettable, illegible, impeccable, impregnable, incredible, inedible, ineffable, inflectional, inflexible, injectable, insensible, intentional, intestinal, jazz festival, lamentable, obsessional, ostensible, perceptible, polemical, preventable, processional, professional, raw vegetable, receptacle, recessional, redemptional, regrettable, respectable, resplendent quetzel, root vegetable, stand sentinel, susceptible, trigeminal, unbendable, unquenchable, unrentable, untellable, untenable

5 syllables:
oecumenical, diametrical, dialectical, geometrical, unsymmetrical, asymmetrical, petrochemical, imperceptible, ecumenical, evangelical, apprehensible, bidirectional, commonsensible, comprehensible, health professional, hexadecimal, homosexual, inaccessible, incompressible, incontestable, incontestible, indefensible, indigestible, indispensable, inexpressible, inextensible, insurrectional, insusceptible, irrepressible, leafy vegetable, nonprofessional, one-dimensional, reprehensible, third-dimensional, three-dimensional, two-dimensional, unacceptable, unaccessible, unamenable, unconventional, uncorrectable, undefendable, undependable, undetectable, unexceptional, unexpendable, unexpressible, unforgettable, uninjectable, unintentional, unpresentable, unpreventable, unprofessional, unrespectable, unsusceptible

6 syllables:
infinitesimal, incomprehensible, heterosexual, multidimensional, omnidirectional, paraprofessional, recurring decimal, religious festival, repeating decimal, semiprofessional, unidimensional, unidirectional

7 syllables:
circulating decimal, electric receptacle