2 syllables:
-itious, itious, licious, rishis, vicious, vitious

3 syllables:
ambitious, ascititious, auspicious, bubblicious, capricious, cilicious, conspicious, convicious, delicious, exitious, factitious, fictitious, flagitious, girlicious, judicious, lubricious, malicious, novitious, nutritious, officious, omniscious, pactitious, pernicious, propitious, seditious, sid vicious, silicious, suspicious, sweet/vicious, tractitious, unpitious, vermicious, wrestlicious

4 syllables:
ablatitious, abstractitious, addititious, adjectitious, adscititious, adventitious, aloysius, arreptitious, artificious, ascriptitious, babelicious, blackalicious, bootylicious, cementitious, cineritious, collatitious, commentitious, conductitious, connutritious, deglutitious, deletitious, demolicious, direptitious, emissitious, exemptitious, expeditious, extispicious, fergalicious, gentilitious, icteritious, impropitious, inauspicious, injudicious, innutritious, inofficious, irreptitious, jerseylicious, lateritious, meretricious, multiplicious, natalitious, obreptitious, obstetricious, pinkalicious, precipitious, prejudicious, profectitious, red delicious, rejectitious, repertitious, repetitious, satellitious, secretitious, self-suspicious, stillatitious, subdititious, subreptitious, superstitious, suppositious, surreptitious, tralatitious, translatitious, unambitious, unauspicious, unmalicious, unofficious, unpropitious, unsuspicious, veneficious

5 syllables:
artifactitious, excrementitious, golden delicious, inimicitious, overambitious, overofficious, oversuspicious, petrosilicious, recrementitious, supposititious, yellow delicious

2 syllables:
blissus, byssus, issus, nisus, visits

3 syllables:
emphasis, nebulous, elements, hephaestus, tetanus, sedulous, petulance, offenseless, fecklessness, membranous, restlessness, excellence, exodus, evidence, pendulous, recklessness, edifice, detritus, blessedness, helplessness, renascence, precedence, helpfulness, pestilence, tremulous, prevalence, eminence, tenebrous, fretfulness, aesculus, pegasus, endlessness, resinous, credulous, resonance, dreadfulness, elephants, eloquence, pleasantness, regulus, daedalus, gentleness, healthfulness, precipice, petalous, specialness, negligence, tendinous, tenuous, emulous, femaleness, genesis, xenopus, venomous, benelux, elegance, relevance, narcissus

4 syllables:
contentiousness, benevolence, inelegance, antecedence, preeminence, beneficence, unpleasantness, affectedness, apetalous, directionless, edematous, shigellosis, state's evidence, maleficence, pink elephants, persepolis, incredulous, irrelevance, intelligence, malevolence, eleven-plus, necessitous, dionysus

5 syllables:
macrocephalous, leptocephalus, atelectasis, conscientiousness, hearsay evidence, hydrocephalus, direct evidence, microcephalous, overemphasis, genus narcissus, parthenocissus

6 syllables:
magnetic resonance, indirect evidence, dicotyledonous

7 syllables:
circumstantial evidence

8 syllables:
artificial intelligence