17 letters
- incorrigibilities27
- indefatigableness29
- indefeasibilities26
- indefectibilities29
- indefensibilities27
- indefinablenesses28
- indescribableness30
- indestructibility29
- indeterminateness24
- indigestibilities25
- indispensableness28
- indissolubilities25
- indomitablenesses27
- indubitablenesses28
- industriousnesses22
- ineffaceabilities31
- ineffectivenesses32
- ineffectualnesses30
- inefficaciousness32
- ineradicabilities26
- inexcusablenesses34
- inexhaustibleness33
- inexpensivenesses34
- inexplicabilities36
- inexpressibleness33
- inextricabilities32
- inflammablenesses33
- informativenesses29
- inheritablenesses25
- injudiciousnesses34
- inoffensivenesses30
- inoperativenesses26
- inopportunenesses27
- inquisitivenesses33
- inscrutablenesses27
- insensitivenesses24
- inseparablenesses26
- instantaneousness22
- institutionalises21
- institutionalizes30
- instructivenesses27
- instrumentalities24
- insurrectionaries23
- intellectualities25
- intelligibilities26
- intemperatenesses25
- intercommunicates32
- interdependencies28
- interestingnesses22
- internationalises21
- internationalizes30
- interprofessional26
- intertextualities27
- intervisibilities26
- intolerablenesses24
- introspectiveness29
- involuntarinesses26
- invulnerabilities29
- irrecoverableness29
- irreformabilities27
- irrefragabilities26
- irreparablenesses25
- irrepealabilities25
- irreplaceableness29
- irresistibilities21
- irresponsibleness26
- irreversibilities25
- irrevocablenesses29
- kindheartednesses27
- knowledgeableness34
- lepidopterologies28
- levelheadednesses28
- longsightednesses27
- lymphadenopathies35
- magnanimousnesses29
- magnetoresistance27
- maintainabilities26
- maneuverabilities30
- marriageabilities26
- meaninglessnesses26
- mellifluousnesses29
- merchantabilities30
- meritoriousnesses22
- mesembryanthemums38
- microencapsulates32
- micromorphologies34
- microphotometries31
- microseismicities29
- microsporogeneses29
- microsporogenesis29
- microvasculatures33
- miscellaneousness28
- mischievousnesses31
- misrepresentation25
- misrepresentative28
- mistrustfulnesses27
- monospecificities33
- monosyllabicities31
- mountainousnesses25
- multibillionaires28
- multimillionaires28
- multitudinousness27
- nearsightednesses24
- necessitarianisms25
- necessitousnesses23
- neurofibromatoses28
- neurophysiologies29
- neuropsychiatries29
- neuropsychologies32
- nonavailabilities28
- nonbelligerencies30
- nonbiodegradables30
- noncontemporaries29
- nonecclesiastical30
- nonestablishments29
- nonflammabilities33
- nonproductiveness32
- nonprofessionally30
- nonrepresentative27
- nonsensicalnesses25
- nucleophilicities32
- objectionableness38
- obstructivenesses29
- odoriferousnesses23
- openheartednesses25
- openmouthednesses29
- opinionatednesses24
- opprobriousnesses28
- orthopsychiatries29
- overambitiousness29
- overfamiliarities28
- overorchestrating29
- overprescriptions31
- oversensitiveness27
- oversensitivities26
- overzealousnesses33
- ovoviviparousness34
- paradoxicalnesses33
- paraformaldehydes33
- paraprofessionals28
- pathophysiologies32
- perfunctorinesses29
- permissiblenesses28
- persnicketinesses29
- perspicaciousness31
- perspicuousnesses29
- pestiferousnesses25
- pharisaicalnesses27
- pharmacotherapies33
- phenylethylamines35
- phosphodiesterase28
- phosphoglycerates35
- photorespirations26
- photosynthesizing39
- phototelegraphies30
- phototypesettings30
- physiopathologies32
- picturesquenesses35
- pithecanthropines32
- plainspokennesses31
- pleasurablenesses27
- plenipotentiaries26
- plethysmographies35
- postresurrections25
- practicablenesses31
- precipitantnesses28
- precipitatenesses27
- precipitousnesses28
- predestinarianism26
- prefigurativeness31
- prejudicialnesses36
- presentablenesses26
- prestidigitations24
- prestigiousnesses24
- pretentiousnesses23
- preternaturalness24
- professionalizing37
- programmabilities32
- progressivenesses27
- prohibitivenesses30
- promiscuousnesses29
- proportionalities25
- provocativenesses32
- pseudopregnancies32
- psychobiographies37
- psychopathologies35
- psychosexualities36
- punctiliousnesses28
- purposelessnesses26
- pyroelectricities29
- quarrelsomenesses32
- quatercentenaries32
- radioautographies26
- radiotelegraphies26
- recognizabilities36
- reconcilabilities29
- refrangiblenesses28
- rememberabilities30
- remorselessnesses22
- repetitiousnesses22