15 letters
- forgetfulnesses26
- forgivingnesses28
- fortunatenesses21
- fractiousnesses23
- fragmentariness25
- frightfulnesses28
- frivolousnesses25
- fruitlessnesses21
- garrulousnesses21
- gentlemanliness25
- glamorousnesses23
- gracelessnesses22
- grammaticalness28
- grandiosenesses20
- greensicknesses26
- grotesquenesses28
- guilelessnesses21
- guiltlessnesses21
- habitablenesses25
- halfheartedness25
- haphazardnesses33
- hardheartedness22
- hazardousnesses29
- healthfulnesses26
- heartlessnesses19
- heartsicknesses25
- hilariousnesses20
- homogeneousness25
- honorablenesses23
- hotheadednesses22
- houselessnesses20
- housewifeliness26
- humorlessnesses23
- hyperaggressive30
- identicalnesses22
- idiomaticnesses23
- ignominiousness24
- illiberalnesses22
- illimitableness25
- illogicalnesses24
- illustriousness20
- imaginarinesses22
- imaginativeness26
- imitativenesses23
- immediatenesses23
- immovablenesses30
- immutablenesses27
- impassivenesses26
- impecuniousness28
- imperfectnesses28
- imperiousnesses23
- impetuousnesses24
- implicativeness30
- importunateness24
- imprecisenesses25
- impregnableness29
- impressionistic25
- impulsivenesses28
- inaccessibility28
- inalterableness22
- inanimatenesses21
- inattentiveness22
- incapablenesses27
- inclusivenesses26
- incongruousness25
- incorrectnesses23
- incorruptnesses24
- incuriousnesses22
- indefinableness26
- indomitableness25
- indubitableness26
- industriousness20
- ineffablenesses27
- ineffectiveness30
- ineffectualness28
- inexcusableness32
- inexpensiveness32
- inflammableness31
- informativeness27
- infusiblenesses25
- ingeniousnesses21
- ingenuousnesses22
- inheritableness23
- injudiciousness32
- injuriousnesses28
- innocuousnesses23
- inoffensiveness28
- inoperativeness24
- inopportuneness25
- inquisitiveness31
- insatiatenesses17
- inscrutableness25
- insensitiveness22
- inseparableness24
- insidiousnesses19
- insolublenesses23
- instructiveness25
- intemperateness23
- intensivenesses22
- interestingness20
- intolerableness22
- intricatenesses20
- intrusivenesses22
- intuitivenesses22
- invectivenesses28
- inventivenesses26
- invidiousnesses23
- inviolatenesses22
- invisiblenesses25
- involuntariness24
- irasciblenesses23
- irreparableness23
- irrevocableness27
- irritablenesses20
- judiciousnesses31
- kindheartedness25
- kittenishnesses23
- laboriousnesses21
- laughablenesses26
- lecherousnesses23
- leisurelinesses19
- levelheadedness26
- lickerishnesses26
- lightfastnesses24
- lightsomenesses24
- limitlessnesses21
- litigiousnesses20
- loathsomenesses22
- longsightedness25
- lucrativenesses25
- ludicrousnesses23
- luxuriousnesses27
- magnanimousness27
- maladroitnesses21
- maliciousnesses24
- marvelousnesses25
- masterfulnesses24
- meaninglessness24
- mellifluousness27
- melodiousnesses22
- memorablenesses26
- mercenarinesses23
- mercilessnesses23
- mercurialnesses24
- meritoriousness20
- microprocessors27
- millionairesses21
- mischievousness29
- miserablenesses23
- misguidednesses24
- mistrustfulness25
- momentarinesses23
- momentousnesses24
- monstrousnesses21
- mountainousness23
- multiprocessing29
- multiprocessors26
- murderousnesses22
- nearsightedness22
- necessitousness21
- nervelessnesses22
- niggardlinesses23
- noncompressible30
- nonprofessional25
- nonprofessorial24
- nonprogressives26
- nonrandomnesses23
- nonsensicalness23
- nonuniquenesses30
- normativenesses24
- objectivenesses35
- obliviousnesses25
- obnoxiousnesses28
- obsessivenesses23
- obstinatenesses20
- obstructiveness27
- obtrusivenesses24
- odoriferousness21
- offensivenesses27
- offhandednesses27
- officiousnesses26
- openheartedness23
- openmouthedness27
- operativenesses23
- opinionatedness22
- opportunenesses24
- opprobriousness26
- outspokennesses25
- overassessments23
- overcompressing31
- overeagernesses22
- oversweetnesses23
- overzealousness31
- painterlinesses21
- palatablenesses24
- paradoxicalness31
- peaceablenesses26
- pendulousnesses24
- penuriousnesses22
- perfunctoriness27