3 syllables:
missional

4 syllables:
additional, adicional, attritional, cognitional, commissional, condicional, conditional, nutritional, parishional, partitional, positional, salicional, suspicional, tradicional, traditional, transitional, tuitional, volitional

5 syllables:
acquisitional, apparitional, appositional, avolitional, biconditional, coalitional, compositional, definitional, depositional, dispositional, disquisitional, expositional, imbibitional, inconditional, inquisitional, intuitional, non-traditional, nontraditional, oppositional, postpositional, prepositional, propositional, repetitional, suppositional, transpositional, unconditional

6 syllables:
decompositional, juxtapositional, presuppositional

7 syllables:
load-link/store-conditional, sensori-volitional

2 syllables:
climbable

3 syllables:
sinkable, cinquefoil, printable, risible, principal, synchronal, clinical, vincible, pitiful, pivotal, livable, criminal, tillable, imbecile, principle, liveable, syllable, integral, biblical, shrinkable, finagle, bimetal, minimal, mythical, binnacle, thinkable, visible, quizzical, mixable, digital, biddable, visual, drinkable, pinnacle, fixable, pinochle, bridgeable, miscible, trigonal, typical, fictional, victual, bindable, cystocele, finical, silicle, thimbleful

4 syllables:
unbridgeable, indictable, invisible, permissible, disenable, disyllable, pontifical, original, veridical, provisional, transmissible, forgivable, war criminal, admissible, despicable, immiscible, convincible, rescindable, assignable, equivocal, dividable, transmittable, predictable, germicidal, anticlinal, unsinkable, invincible, reciprocal, divisional, undrinkable, univocal, divisible, hospitable, unprintable, meningocele, juridical, miserable, medicinal, episcopal, disciplinal, explicable, formidable, admittable, antipodal, unthinkable, resistible, political, municipal, extricable, unlivable, dissyllable, admittible, duplicable, first principle, in principle, life principle, nonfictional, papistical, school principal, sophistical, trisyllable, unclimbable, unliveable, unmixable, unshrinkable

5 syllables:
eosinophil, unpredictable, paralytical, polysyllable, reconcilable, unforgivable, inhospitable, irresistible, inadmissible, unequivocal, unoriginal, curvilineal, diacritical, aboriginal, pleasure principle, conciliable, inexplicable, archiepiscopal, individual, octosyllable, archepiscopal, basic principle, bitter principle, decasyllable, desperate criminal, legal principle, monosyllable, moral principle, nonmedicinal, nonreciprocal, nontransmissible, unassignable, unmedicinal, vital principle, working principle

6 syllables:
aphrodisiacal, paradisiacal, inextinguishable, exclusion principle, definite integral, coenobitical, judicial principle

7 syllables:
indefinite integral, habitual criminal, reality principle, myelomeningocele, psychoanalytical, uncertainty principle, fundamental principle

8 syllables:
pauli exclusion principle