| inconspicuousness | (noun) the quality of being not easily seen | - |
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| indecorousness | (noun) a lack of decorum | Synonyms: indecorum |
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| indigenousness | (noun) nativeness by virtue of originating or occurring naturally (as in a particular place) | Synonyms: autochthony, endemism |
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| industriousness | (noun) persevering determination to perform a task | Synonyms: diligence, industry |
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| inefficaciousness | (noun) a lack of efficacy | Synonyms: inefficacy |
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| ingeniousness | (noun) the property of being ingenious | Synonyms: cleverness, ingenuity |
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| (noun) the power of creative imagination | Synonyms: cleverness, ingenuity, inventiveness |
| ingenuousness | (noun) openly straightforward or frank | - |
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| (noun) the quality of innocent naivete | Synonyms: artlessness, innocence, naturalness |
| inharmoniousness | (noun) a lack of harmony | Synonyms: disharmony |
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| injudiciousness | (noun) the trait of being injudicious | Synonyms: indiscretion |
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| (noun) lacking good judgment | Synonyms: indiscreetness |
| injuriousness | (noun) destructiveness that causes harm or injury | Synonyms: harmfulness |
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| insalubriousness | (noun) the quality of being insalubrious and debilitating | Synonyms: insalubrity |
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| insidiousness | (noun) subtle and cumulative harmfulness (especially of a disease) | - |
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| (noun) the quality of being designed to entrap | - |
| instantaneousness | (noun) the quickness of action or occurrence | Synonyms: immediacy, immediateness, instancy |
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| irreligiousness | (noun) the quality of not being devout | Synonyms: irreligion |
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| jailhouse | (noun) a correctional institution used to detain persons who are in the lawful custody of the government (either accused persons awaiting trial or convicted persons serving a sentence) | Synonyms: clink, gaol, jail, pokey, poky, slammer |
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| jalousie | (noun) a shutter made of angled slats | - |
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| (noun) a window with glass louvers | Synonyms: louvered window |
| jealousy | (noun) zealous vigilance | - |
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| (noun) a feeling of jealous envy (especially of a rival) | Synonyms: green-eyed monster |
| joust | (noun) a combat between two mounted knights tilting against each other with blunted lances | Synonyms: tilt |
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| joyousness | (noun) the emotion of great happiness | Synonyms: joy, joyfulness |
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| judiciousness | (noun) the trait of forming opinions by distinguishing and evaluating | Synonyms: sagaciousness, sagacity |
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| (noun) good judgment | - |
| laboriousness | (noun) the quality of requiring extended effort | Synonyms: operoseness, toilsomeness |
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| lamphouse | (noun) housing that holds a lamp (as in a movie projector) | Synonyms: lamp house, lamp housing |
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| langouste | (noun) large edible marine crustacean having a spiny carapace but lacking the large pincers of true lobsters | Synonyms: crawfish, crayfish, rock lobster, sea crawfish, spiny lobster |
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| (noun) warm-water lobsters without claws; those from Australia and South Africa usually marketed as frozen tails; caught also in Florida and California | Synonyms: crayfish, rock lobster, spiny lobster |
| langoustine | (noun) caught in European waters; slenderer than American lobster | Synonyms: Norwegian lobster, scampo |
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| larcenous | (noun) having a disposition to steal | Synonyms: thievishness |
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| lasciviousness | (noun) feeling morbid sexual desire or a propensity to lewdness | Synonyms: carnality, lubricity, prurience, pruriency |
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| lecherousness | (noun) a strong sexual desire | Synonyms: lust, lustfulness |
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| licentiousness | (noun) dissolute indulgence in sensual pleasure | Synonyms: dissipation, dissolution, looseness, profligacy |
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| (noun) the quality of being lewd and lascivious | Synonyms: wantonness |
| lighthouse | (noun) a tower with a light that gives warning of shoals to passing ships | Synonyms: beacon, beacon light, pharos |
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| limousine | (noun) large luxurious car; usually driven by a chauffeur | Synonyms: limo |
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| litigiousness | (noun) a quarrelsome disposition to engage in or carry on lawsuits | - |
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| lobscouse | (noun) a stew of meat and vegetables and hardtack that is eaten by sailors | Synonyms: lobscuse, scouse |
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| loquaciousness | (noun) the quality of being wordy and talkative | Synonyms: garrulity, garrulousness, loquacity, talkativeness |
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| louse | (noun) wingless usually flattened bloodsucking insect parasitic on warm-blooded animals | Synonyms: sucking louse |
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| (noun) any of several small insects especially aphids that feed by sucking the juices from plants | Synonyms: plant louse |
| (noun) wingless insect with mouth parts adapted for biting; mostly parasitic on birds | Synonyms: bird louse, biting louse |
| (noun) a person who has a nasty or unethical character undeserving of respect | Synonyms: dirt ball, insect, worm |
| lousiness | (noun) the quality of being disgusting to the senses or emotions | Synonyms: loathsomeness, repulsiveness, sliminess, vileness, wickedness |
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| (noun) infestation with lice (Pediculus humanus) resulting in severe itching | Synonyms: pediculosis |
| lugubriousness | (noun) the quality of excessive mournfulness and uncheerfulness | Synonyms: gloominess, sadness |
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| luminousness | (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness, brightness level, light, luminance, luminosity |
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| lusciousness | (noun) extreme appetizingness | Synonyms: delectability, deliciousness, toothsomeness |
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| luxuriousness | (noun) wealth as evidenced by sumptuous living | Synonyms: luxury, opulence, sumptuousness |
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| madhouse | (noun) pejorative terms for an insane asylum | Synonyms: Bedlam, booby hatch, crazy house, cuckoo's nest, funny farm, funny house, loony bin, nut house, nuthouse, sanatorium, snake pit |
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| magnanimousness | (noun) the quality of elevation of mind and exaltation of character or ideals or conduct | Synonyms: grandeur, nobility, nobleness |
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| maliciousness | (noun) feeling a need to see others suffer | Synonyms: malice, spite, spitefulness, venom |
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| malodorousness | (noun) the attribute of having a strong offensive smell | Synonyms: fetidness, foulness, rankness, stinkiness |
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| meetinghouse | (noun) a building for religious assembly (especially Nonconformists, e.g., Quakers) | Synonyms: conventicle |
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| melodiousness | (noun) the property of having a melody | Synonyms: tunefulness |
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| meretriciousness | (noun) an appearance of truth that is false or deceptive; seeming plausibility | Synonyms: speciousness |
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| (noun) tasteless showiness | Synonyms: brashness, flashiness, garishness, gaudiness, glitz, loudness, tawdriness |
| meritoriousness | (noun) the quality of being deserving (e.g., deserving assistance) | Synonyms: deservingness, merit |
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| meticulousness | (noun) strict attention to minute details | Synonyms: meticulosity, punctiliousness, scrupulousness |
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| mischievousness | (noun) reckless or malicious behavior that causes discomfort or annoyance in others | Synonyms: devilment, devilry, deviltry, mischief-making, mischief, rascality, roguery, roguishness, shenanigan |
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| (noun) an attribute of mischievous children | Synonyms: badness, naughtiness |
| (noun) the trait of behaving like an imp | Synonyms: impishness, puckishness, whimsicality |
| momentousness | (noun) utmost importance | - |
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| monogamousness | (noun) the practice or state of having only one spouse at a time | Synonyms: monogamy |
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| mouse | (noun) any of numerous small rodents typically resembling diminutive rats having pointed snouts and small ears on elongated bodies with slender usually hairless tails | - |
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| (noun) a hand-operated electronic device that controls the coordinates of a cursor on your computer screen as you move it around on a pad; on the bottom of the device is a ball that rolls on the surface of the pad | Synonyms: computer mouse |
| (noun) person who is quiet or timid | - |
| (noun) a swollen bruise caused by a blow to the eye | Synonyms: black eye, shiner |
| mousepad | (noun) a small portable pad that provides traction for the ball of a computer mouse | Synonyms: mouse mat |
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| mouser | (noun) a cat proficient at mousing | - |
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| mousetrap | (noun) (American football) a play in which a defensive player is allowed to cross the line of scrimmage and then blocked off as the runner goes through the place the lineman vacated | Synonyms: trap play |
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| (noun) a trap for catching mice | - |
| moussaka | (noun) casserole of eggplant and ground lamb with onion and tomatoes bound with white sauce and beaten eggs | - |
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| mousse | (noun) toiletry consisting of an aerosol foam used in hair styling | Synonyms: hair mousse |
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| (noun) a light creamy dish made from fish or meat and set with gelatin | - |
| (noun) a rich, frothy, creamy dessert made with whipped egg whites and heavy cream | - |
| moustache | (noun) an unshaved growth of hair on the upper lip | Synonyms: mustache |
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| moustachio | (noun) a large bushy moustache (with hair growing sometimes down the sides of the mouth) | Synonyms: handle-bars, mustachio |
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| multifariousness | (noun) noticeable heterogeneity | Synonyms: diverseness, diversity, variety |
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| multitudinousness | (noun) a very large number (especially of people) | - |
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| murderousness | (noun) cruelty evidence by a capability to commit murder | - |
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| (noun) a bloodthirsty hatred arousing murderous impulses | - |
| nefariousness | (noun) the quality of being wicked | Synonyms: ugliness, vileness, wickedness |
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| nervousness | (noun) a sensitive or highly strung temperament | - |
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| (noun) the anxious feeling you have when you have the jitters | Synonyms: jitteriness, jumpiness, restiveness |
| (noun) an uneasy psychological state | Synonyms: nerves |
| nous | (noun) that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason | Synonyms: brain, head, mind, psyche |
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| (noun) common sense | - |
| noxiousness | (noun) the quality of being noxious | Synonyms: harmfulness, noisomeness |
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| numerousness | (noun) a large number | Synonyms: multiplicity, numerosity |
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| nuthouse | (noun) pejorative terms for an insane asylum | Synonyms: Bedlam, booby hatch, crazy house, cuckoo's nest, funny farm, funny house, loony bin, madhouse, nut house, sanatorium, snake pit |
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| nutritiousness | (noun) the quality of being nourishing and promoting healthy growth | Synonyms: nutritiveness |
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| obliviousness | (noun) total forgetfulness | Synonyms: oblivion |
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| obnoxiousness | (noun) the quality of being hateful | Synonyms: hatefulness, objectionableness |
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| obsequiousness | (noun) abject or cringing submissiveness | Synonyms: servility, subservience |
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| obstreperousness | (noun) noisy defiance | - |
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| obviousness | (noun) the property of being easy to see and understand | Synonyms: noticeability, noticeableness, patency |
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| odiousness | (noun) the quality of being offensive | Synonyms: distastefulness, offensiveness |
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| officiousness | (noun) aggressiveness as evidenced by intruding; by advancing yourself or your ideas without invitation | Synonyms: intrusiveness, meddlesomeness |
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| oleaginousness | (noun) consisting of or covered with oil | Synonyms: greasiness, oiliness |
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| (noun) smug self-serving earnestness | Synonyms: fulsomeness, oiliness, smarminess, unction, unctuousness |
| ominousness | (noun) The quality of giving indication of a coming ill; being an evil omen; being threatening, portentous, inauspicious. | - |
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| omnivorousness | (noun) The state of eating both animal and plant matter. | - |
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| onerousness | (noun) unwelcome burdensome difficulty | Synonyms: burdensomeness, heaviness, oppressiveness |
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| ostentatiousness | (noun) lack of elegance as a consequence of being pompous and puffed up with vanity | Synonyms: inflation, ostentation, pomposity, pompousness, pretentiousness, puffiness, splashiness |
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| ousel | (noun) common black European thrush | Synonyms: blackbird, European blackbird, merl, merle, ouzel, Turdus merula |
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| ouster | (noun) the act of ejecting someone or forcing them out | Synonyms: ousting |
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| (noun) a wrongful dispossession | - |
| (noun) a person who ousts or supplants someone else | Synonyms: ejector |
| ousting | (noun) the act of ejecting someone or forcing them out | Synonyms: ouster |
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| outhouse | (noun) a small outbuilding with a bench having holes through which a user can defecate | Synonyms: earth-closet, jakes, privy |
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| outrageousness | (noun) the quality of being outrageous | Synonyms: enormity |
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| (noun) excessive excess | Synonyms: exorbitance |
| overzealousness | (noun) The quality of being excessively zealous. | Synonyms: overzeal |
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| packinghouse | (noun) a plant where livestock are slaughtered and processed and packed as meat products | Synonyms: packing plant |
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| (noun) a building where foodstuffs are processed and packed | - |
| parsimoniousness | (noun) extreme care in spending money; reluctance to spend money unnecessarily | Synonyms: parsimony, penny-pinching, thrift |
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| (noun) extreme stinginess | Synonyms: closeness, meanness, minginess, niggardliness, niggardness, parsimony, tightfistedness, tightness |
| penthouse | (noun) an apartment located on the top floors of a building | - |
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| penuriousness | (noun) a disposition to be niggardly with money | - |
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| (noun) a state of lacking money | Synonyms: impecuniousness, pennilessness |
| perfidiousness | (noun) betrayal of a trust | Synonyms: perfidy, treachery |
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| perilousness | (noun) the state of being dangerous | Synonyms: hazardousness |
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| perniciousness | (noun) grave harmfulness or deadliness | Synonyms: toxicity |
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| perspicaciousness | (noun) intelligence manifested by being astute (as in business dealings) | Synonyms: astuteness, perspicacity, shrewdness |
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| perspicuousness | (noun) clarity as a consequence of being perspicuous | Synonyms: perspicuity, plainness |
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| perviousness | (noun) the quality of being penetrable (by people or light or missiles etc.) | Synonyms: penetrability |
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| pesthouse | (noun) hospital for persons with infectious diseases (especially leprosy) | Synonyms: lazar house, lazaret, lazarette, lazaretto |
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| pilothouse | (noun) an enclosed compartment from which a vessel can be navigated | Synonyms: wheelhouse |
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| piousness | (noun) righteousness by virtue of being pious | Synonyms: piety |
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