| neckless | (adjective) lacking or apparently lacking a neck | - |
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| nectariferous | (adjective) possessing nectaries | - |
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| nectarous | (adjective) extremely pleasing to the taste; sweet and fragrant | Synonyms: ambrosial, ambrosian |
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| needless | (adjective) unnecessary and unwarranted | Synonyms: gratuitous, uncalled-for |
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| nefarious | (adjective) extremely wicked | Synonyms: villainous |
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| neotenous | (adjective) of or relating to or characterized by neoteny | Synonyms: neotenic |
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| nerveless | (adjective) marked by calm self-control (especially in trying circumstances); unemotional | Synonyms: cool, coolheaded |
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| (adjective) lacking strength | Synonyms: feeble |
| nervous | (adjective) of or relating to the nervous system | Synonyms: neural |
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| (adjective) unpredictably excitable (especially of horses) | Synonyms: flighty, skittish, spooky |
| (adjective) excited in anticipation | Synonyms: aflutter |
| (adjective) easily agitated | - |
| (adjective) causing or fraught with or showing anxiety | Synonyms: anxious, queasy, uneasy, unquiet |
| neuromatous | (adjective) of or relating to or caused by neuromas | - |
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| newsless | (adjective) not providing news or information | - |
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| (adjective) not having or receiving news or information | - |
| nidicolous | (adjective) (of birds) remaining in the nest for a time after hatching | - |
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| nidifugous | (adjective) (of birds) leaving the nest shortly after hatching | - |
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| nitrogenous | (adjective) of or relating to or containing nitrogen | Synonyms: nitrogen-bearing |
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| nitrous | (adjective) of or containing nitrogen | Synonyms: azotic, nitric |
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| noiseless | (adjective) making no sound | - |
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| nonautonomous | (adjective) (of peoples and political bodies) controlled by outside forces | Synonyms: nonsovereign |
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| nonconscious | (adjective) relating to the lack of consciousness of inanimate things | - |
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| (adjective) concerning mental functioning that is not represented in consciousness | - |
| noncontagious | (adjective) (of disease) not capable of being passed on | Synonyms: noncommunicable, nontransmissible |
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| noncontentious | (adjective) of persons; not given to controversy | - |
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| noncontinuous | (adjective) not continuing without interruption in time or space | Synonyms: discontinuous |
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| nonglutinous | (adjective) not resembling glue in texture | Synonyms: nonviscid |
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| nongregarious | (adjective) of plants and animals; not growing or living in groups or colonies | Synonyms: nonsocial, solitary |
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| noninfectious | (adjective) not infectious | - |
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| nonpoisonous | (adjective) safe to eat | Synonyms: non-poisonous, nontoxic |
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| (adjective) not producing poison | Synonyms: non-poisonous |
| nonporous | (adjective) not porous; especially not having vessels that appear as pores | - |
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| nonresinous | (adjective) not having resin | Synonyms: non-resinous, non-resiny, nonresiny |
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| nonsynchronous | (adjective) not occurring together | Synonyms: unsynchronised, unsynchronized, unsynchronous |
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| nonvenomous | (adjective) not producing venom | - |
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| noseless | (adjective) having no nose | - |
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| notorious | (adjective) known widely and usually unfavorably | Synonyms: ill-famed, infamous |
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| noxious | (adjective) injurious to physical or mental health | - |
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| numberless | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, innumerous, multitudinous, myriad, uncounted, unnumberable, unnumbered, unnumerable |
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| numerous | (adjective) amounting to a large indefinite number | Synonyms: legion |
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| numinous | (adjective) of or relating to or characteristic of a numen | - |
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| (adjective) evincing the presence of a deity | - |
| nutritious | (adjective) of or providing nourishment | Synonyms: alimental, alimentary, nourishing, nutrient, nutritive |
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| nuts | (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, loopy, nutty, round the bend, wacky, whacky |
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| oblivious | (adjective) failing to keep in mind | Synonyms: forgetful |
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| (adjective) (followed by `to' or `of') lacking conscious awareness of | Synonyms: unmindful |
| obnoxious | (adjective) causing disapproval or protest | Synonyms: objectionable |
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| obsequious | (adjective) attempting to win favor from influential people by flattery | Synonyms: bootlicking, fawning, sycophantic, toadyish |
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| (adjective) attentive in an ingratiating or servile manner | - |
| obstreperous | (adjective) boisterously and noisily aggressive | - |
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| (adjective) noisily and stubbornly defiant | - |
| obvious | (adjective) easily perceived and understood | - |
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| odious | (adjective) unequivocally detestable | Synonyms: abominable, detestable, execrable |
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| odoriferous | (adjective) having a natural fragrance | Synonyms: odorous, perfumed, scented, sweet-scented, sweet-smelling, sweet |
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| (adjective) emitting an odor | Synonyms: odorous |
| odorless | (adjective) having no odor | Synonyms: inodorous, odourless |
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| odorous | (adjective) having odor or a characteristic odor | - |
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| (adjective) having a natural fragrance | Synonyms: odoriferous, perfumed, scented, sweet-scented, sweet-smelling, sweet |
| (adjective) emitting an odor | Synonyms: odoriferous |
| odourless | (adjective) having no odor | Synonyms: inodorous, odorless |
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| offenceless | (adjective) incapable of offending or attacking | Synonyms: offenseless |
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| offenseless | (adjective) incapable of offending or attacking | Synonyms: offenceless |
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| officious | (adjective) intrusive in a meddling or offensive manner | Synonyms: busy, busybodied, interfering, meddlesome, meddling |
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| offsides | (adjective) illegally beyond a prescribed line or area or ahead of the ball or puck | Synonyms: offside |
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| oleaceous | (adjective) of or pertaining to or characteristic of trees or shrubs of the olive family | - |
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| oleaginous | (adjective) containing an unusual amount of grease or oil | Synonyms: greasy, oily, sebaceous |
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| (adjective) unpleasantly and excessively suave or ingratiating in manner or speech | Synonyms: buttery, fulsome, oily, smarmy, soapy, unctuous |
| ominous | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, menacing, minacious, minatory, sinister, threatening |
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| (adjective) presaging ill fortune | Synonyms: ill, inauspicious |
| omnibus | (adjective) providing for many things at once | - |
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| omnifarious | (adjective) of all varieties or forms or kinds | - |
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| omnivorous | (adjective) feeding on both plants and animals | - |
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| onerous | (adjective) not easily borne; wearing | Synonyms: burdensome, taxing |
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| onymous | (adjective) bearing a name | - |
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| opisthognathous | (adjective) having receding jaws | - |
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| opprobrious | (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: black, disgraceful, ignominious, inglorious, shameful |
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| (adjective) expressing offensive reproach | Synonyms: abusive, scurrilous |
| orthotropous | (adjective) (of a plant ovule) completely straight with the micropyle at the apex | - |
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| osseous | (adjective) composed of or containing bone | Synonyms: bony, osteal |
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| ossiferous | (adjective) containing bones (especially fossil bones) | - |
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| ostentatious | (adjective) intended to attract notice and impress others | Synonyms: pretentious |
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| (adjective) (of a display) tawdry or vulgar | Synonyms: pretentious |
| outrageous | (adjective) greatly exceeding bounds of reason or moderation | Synonyms: exorbitant, extortionate, steep, unconscionable, usurious |
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| (adjective) grossly offensive to decency or morality; causing horror | Synonyms: hideous, horrid, horrific |
| overambitious | (adjective) excessively ambitious | - |
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| overanxious | (adjective) anxious or nervous to an excessive degree | - |
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| overcautious | (adjective) unnecessarily cautious | - |
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| overcredulous | (adjective) too credulous for your own good | - |
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| overcurious | (adjective) showing excessive curiosity | - |
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| overgenerous | (adjective) very generous | Synonyms: lavish, munificent, too-generous, unsparing, unstinted, unstinting |
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| overjealous | (adjective) suspicious or unduly suspicious or fearful of being displaced by a rival | Synonyms: green-eyed, jealous |
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| overseas | (adjective) in a foreign country | Synonyms: abroad |
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| (adjective) being or passing over or across the sea | Synonyms: oversea |
| overserious | (adjective) excessively serious | - |
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| oversolicitous | (adjective) excessively solicitous | - |
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| oversuspicious | (adjective) unduly suspicious | - |
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| overzealous | (adjective) marked by excessive enthusiasm for and intense devotion to a cause or idea | Synonyms: fanatic, fanatical, rabid |
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| oviparous | (adjective) egg-laying | - |
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| ovoviviparous | (adjective) producing living young from eggs that hatch within the body | - |
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| ownerless | (adjective) having no owner | Synonyms: unowned |
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| pachydermatous | (adjective) of or relating to or characteristic of pachyderms | Synonyms: pachydermal, pachydermic, pachydermous |
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| (adjective) emotionally hardened | Synonyms: callous, indurate |
| pachydermous | (adjective) of or relating to or characteristic of pachyderms | Synonyms: pachydermal, pachydermatous, pachydermic |
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| painless | (adjective) not causing physical or psychological pain | - |
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| (adjective) requiring little hard work or exertion | - |
| parentless | (adjective) having no parent or parents or not cared for by parent surrogates | Synonyms: unparented |
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| parlous | (adjective) fraught with danger | Synonyms: perilous, precarious, touch-and-go |
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| paroicous | (adjective) having male and female reproductive organs separate in a single gametoecium | - |
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| parous | (adjective) having given birth to one or more viable children | - |
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| parsimonious | (adjective) excessively unwilling to spend | Synonyms: penurious |
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| pass | (adjective) of advancing the ball by throwing it | Synonyms: passing |
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| passionless | (adjective) not passionate | - |
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| (adjective) unmoved by feeling | Synonyms: emotionless |
| pathless | (adjective) lacking pathways | Synonyms: roadless, trackless, untracked, untrod, untrodden |
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| patronless | (adjective) having little patronage or few clients | Synonyms: unpatronised, unpatronized |
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| peerless | (adjective) eminent beyond or above comparison | Synonyms: matchless, nonpareil, one, one and only, unmatchable, unmatched, unrivaled, unrivalled |
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| pelecypodous | (adjective) bivalve | Synonyms: lamellibranch, pelecypod |
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| pemphigous | (adjective) of or relating to or manifesting pemphigus | - |
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| pendulous | (adjective) having branches or flower heads that bend downward | Synonyms: cernuous, drooping, nodding, weeping |
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| penniless | (adjective) not having enough money to pay for necessities | Synonyms: hard up, impecunious, in straitened circumstances, penurious, pinched |
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| pentamerous | (adjective) divided into five parts; specifically, having each floral whorl consist of five (or a multiple of five) members | - |
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| penurious | (adjective) not having enough money to pay for necessities | Synonyms: hard up, impecunious, in straitened circumstances, penniless, pinched |
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| (adjective) excessively unwilling to spend | Synonyms: parsimonious |
| percutaneous | (adjective) through the unbroken skin; refers to medications applied directly to the skin (creams or ointments) or in time-release forms (skin patches) | Synonyms: transcutaneous, transdermal, transdermic |
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