4 syllables:
inteligence, intelligence

5 syllables:
misintelligence

6 syllables:
adult intelligence, combat intelligence, counter-intelligence, counterintelligence, current intelligence, showing intelligence, signals intelligence, superintelligence, terrain intelligence, verbal intelligence

7 syllables:
borderline intelligence, nonverbal intelligence, strategic intelligence, tactical intelligence

8 syllables:
artificial intelligence, electronics intelligence, security intelligence, showing lack of intelligence, telemetry intelligence

9 syllables:
communications intelligence, inter-services intelligence

11 syllables:
a.i. artificial intelligence

3 syllables:
presidents, remissness, reticence, headmistress, sketchiness, pemphigus, oedipus, wretchedness, negligence, penitence, evilness, preciseness, fleshiness, pettishness, lemniscus, pensiveness, restiveness, residence, delphinus, selfishness, greensickness, aesculus, benelux, blessedness, credulous, daedalus, delegates, desmanthus, detritus, dreadfulness, edifice, elegance, elements, elephants, eloquence, eminence, emphasis, emphasise, emulous, endlessness, estimates, evidence, excellence, exodus, fecklessness, fretfulness, friendlessness, gempylus, genesis, gentleness, haemanthus, healthfulness, helpfulness, helplessness, jejuneness, membranous, mespilus, methodists, nebulous, pegasus, pendulous, penstemon deustus, pestilence, petulance, pleasantness, precedence, precedents, preciousness, precipice, prevalence, recklessness, regulus, relevance, resinous, resonance, restfulness, restlessness, sedulous, senselessness, sentiments, settlements, sexlessness, specialists, specialness, temperateness, tendinous, tenebrous, tenuous, tetanus, tremulous, vengefulness, venomous, zestfulness

4 syllables:
retentiveness, receptiveness, objectiveness, impenitence, preexistence, successiveness, nonresistance, perceptiveness, protectiveness, aggressiveness, oppressiveness, expressiveness, contentedness, unselfishness, deceptiveness, progressiveness, impressiveness, excessiveness, directionless, expensiveness, offensiveness, connectedness, defectiveness, attentiveness, intensiveness, feverishness, effectiveness, inventiveness, acceptableness, adenosis, agenesis, antecedence, beneficence, benevolence, cnicus, contentiousness, defencelessness, defenselessness, developments, digenesis, distressfulness, dysgenesis, essentialness, forgetfulness, good-temperedness, impetuousness, incessantness, incredulous, inelegance, irrelevance, licentiousness, malevolence, momentousness, neglectfulness, oogenesis, persepolis, pink elephants, preeminence, pretentiousness, re-emphasise, relentlessness, respectfulness, state's evidence, successfulness, tendentiousness, unhealthfulness, unhelpfulness, unpleasantness

5 syllables:
comprehensiveness, ineffectiveness, apprehensiveness, unexpectedness, acrocephalus, ambidextrousness, androgenesis, anencephalous, arctocephalus, autogenesis, biogenesis, blastogenesis, cacogenesis, caenogenesis, cainogenesis, cenogenesis, chirocephalus, cogent evidence, conscientiousness, cynocephalus, cytogenesis, direct evidence, epigenesis, epinephelus, gynogenesis, hearsay evidence, hydrocephalus, kainogenesis, kenogenesis, leptocephalus, macrocephalous, metagenesis, microcephalous, microcephalus, monogenesis, moral excellence, myxocephalus, ontogenesis, overemphasis, palingenesis, pathogenesis, phylogenesis, pyrocephalus, rule of evidence, sacrilegiousness, sarcocephalus, stenopelmatus, unacceptableness, unpretentiousness, xenogenesis

6 syllables:
interconnectedness, abiogenesis, agamogenesis, amelogenesis, anthropogenesis, atherogenesis, funeral-residence, gorgonocephalus, heterocephalus, heterogenesis, indirect evidence, magnetic resonance, nuclear resonance, parthenogenesis, platypoecilus, spermatogenesis, unconscientiousness

7 syllables:
circumstantial evidence

8 syllables:
proton magnetic resonance