9 letters:
industrie

11 letters:
subindustry

13 letters:
agro-industry

5 letters:
italy

6 letters:
infamy, wicopy, dimity, wiggly, fixity, litany, bigamy, sicily, simile

7 letters:
visibly, timpani, tiffany, utility, timothy, willowy, dittany, acidity, aridity, fidgety, vividly, trilogy, finicky, trinity, imagery, bigotry, ability, avidity, dingily, mistily, rickety, dignity, tripoli, timidly, agility, infancy, syncope, giddily, dizzily, epitome, hymnody, licitly, millime, ribbony, twinkly, windily, wriggly

8 letters:
polygyny, futility, symphony, vicinity, visually, tinselly, salinity, exiguity, sympathy, virility, stickily, solidity, signally, rigidity, ministry, rapidity, tumidity, vapidity, toxicity, fluidity, humidity, timidity, filigree, civility, symmetry, affinity, stingily, sapidity, senility, brittany, infinity, instancy, villainy, dismally, epiphany, docility, fiscally, wilfully, polygamy, tepidity, felicity, antigone, activity, tonicity, validity, finitely, mobility, minutely, viridity, nobility, debility, piquancy, divinity, chivalry, infantry, nativity, exigency, acridity, bishopry, filthily, flindosy, frigidly, gelidity, motivity, prissily, trickily, viscidly

9 letters:
viscidity, facsimile, hostility, captivity, synchrony, torridity, indignity, antiquity, publicity, invisibly, flippancy, viciously, liquidity, atonicity, instantly, turbidity, fragility, antipathy, cyclicity, initially, fertility, polyphony, torpidity, soliloquy, abysmally, miserably, proximity, limpidity, turgidity, inutility, festivity, placidity, literally, willfully, aborigine, immorally, liberally, unanimity, viability, prolixity, culicidae, ductility, asymmetry, morbidity, irritably, acclivity, chintzily, declivity, lingually, malignity, rusticity, skilfully, stolidity, tactility, winsomely

10 letters:
proclivity, skillfully, magistracy, benignancy, gravimetry, malignancy, relativity, stringency, creativity, implicitly, alkalinity, resiliency, amiability, originally, brilliancy, elasticity, spitefully, deficiency, spasticity, officially, complicity, volatility, asynchrony, legibility, negativity, invalidity, infelicity, simplicity, flaccidity, pasigraphy, flippantly, insipidity, femininity, explicitly, sphericity, somniloquy, efficiency, reactivity, capability, forgivably, imbecility, insistency, mendicancy, minstrelsy, mutability, notability, pipal tree, plasticity, risibility, sanguinity

11 letters:
proficiency, alkalimetry, whiffletree, contingency, reliability, masculinity, obstinately, astringency, pellucidity, probability, periodicity, domesticity, antistrophe, ambitiously, brilliantly, delinquency, deliciously, magnanimity, apocynaceae, ellipticity, versatility, religiously, catholicity, electricity, intrepidity, sufficiency, calorimetry, feasibility, whippletree, differently, flexibility, possibility, amphictyony, specificity, swingletree, consistency, colorimetry, efficiently, selectivity, calligraphy, amicability, analyticity, expansivity, permissibly, persistency, persnickety, propinquity, quizzically, quotability, reluctivity, resistivity, retentivity, stringently, syllabicity, tangibility, unthinkably, ventriloquy

12 letters:
sufficiently, idiosyncrasy, invisibility, eccentricity, auspiciously, unofficially, individually, perniciously, inefficiency, availability, artificially, conductivity, sweet cicely, malleability, holy trinity, deliberately, peripherally, additionally, consistently, chromaticity, irritability, fortuitously, adaptability, palatability, productivity, irresistibly, propitiously, avariciously, absorptivity, equatability, excitability, illegibility, immutability, incapability, inelasticity, inhospitably, perceptivity, reflectivity, refractivity, reputability, semifluidity, sex activity, shittah tree, transitivity, unforgivably

13 letters:
intermittency, compatibility, cucurbitaceae, expeditiously, insufficiency, contractility, conditionally, unequivocally, supersymmetry, injudiciously, acceptability, radioactivity, applicability, pusillanimity, inconsistency, promiscuously, traditionally, inefficiently, unchristianly, admissibility, insensitivity, ignominiously, antifertility, commutability, concentricity, consanguinity, correlativity, deductibility, despicability, digestibility, duplicability, impermissibly, improbability, ineligibility, infeasibility, insensibility, intangibility, permutability, progressivity, reversibility, unambitiously, unfeasibility, unpredictably, unsuitability, with sympathy, with validity

14 letters:
inauspiciously, superciliously, insufficiently, susceptibility, bioelectricity, meretriciously, perfectibility, responsibility, public utility, human activity, impeachability, implausibility, inconsistently, inscrutability, intransitivity, mental ability, mental imagery, perceptibility, practicability, sapodilla tree, stretchability, suggestibility, taoist trinity, unadaptability, unpalatability, unpropitiously, with hostility

15 letters:
radial symmetry, surreptitiously, inaccessibility, sexual activity, neuropsychiatry, unconditionally, approachability, blessed trinity, compressibility, contemptibility, disreputability, granadilla tree, imperishability, inadmissibility, inapplicability, incommutability, indigestibility, indisputability, intelligibility, irreversibility, magical ability, mass deficiency, mirror symmetry, natural ability, put differently, social activity, unacceptability, with efficiency, zinc deficiency

16 letters:
self-sufficiency, piezoelectricity, hydroelectricity, irresponsibility, lactobacillaceae, capital of italy, chondrodystrophy, imperceptibility, imperturbability, impracticability, inconvertibility, irrepressibility, latent hostility, learning ability, physical ability, radial asymmetry, reprehensibility, sensory activity, substitutability, unsusceptibility, without sympathy

17 letters:
superconductivity, relative humidity, comprehensibility, joint probability, mental deficiency, photoconductivity, thermoelectricity, business activity, higgledy-piggledy, incompressibility, unapproachability, unintelligibility

18 letters:
general relativity, bilateral symmetry, anthropocentricity, muscular dystrophy, static electricity, special relativity, doctor of divinity, in all probability, master of divinity, offensive activity

19 letters:
commercial activity, current electricity, dynamic electricity, military capability, subversive activity

20 letters:
theory of relativity, juvenile delinquency, australian aborigine, bachelor of divinity, civic responsibility, educational activity, indistinguishability, irrational hostility, operating capability

21 letters:
intelligence activity

22 letters:
performance capability

23 letters:
atmospheric electricity, sense of responsibility

24 letters:
extracurricular activity

25 letters:
coefficient of elasticity

27 letters:
conservation of electricity

28 letters:
general theory of relativity, special theory of relativity

30 letters:
without showing responsibility