| millionth | (adjective) the ordinal number of one million in counting order | - |
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| mirthful | (adjective) arousing or provoking laughter | Synonyms: amusing, comic, comical, funny, laughable, risible |
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| (adjective) full of or showing high-spirited merriment | Synonyms: gay, jocund, jolly, jovial, merry |
| mirthless | (adjective) lacking mirth | - |
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| misanthropic | (adjective) believing the worst of human nature and motives; having a sneering disbelief in e.g. selflessness of others | Synonyms: cynical, misanthropical |
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| (adjective) hating mankind in general | Synonyms: misanthropical |
| misanthropical | (adjective) believing the worst of human nature and motives; having a sneering disbelief in e.g. selflessness of others | Synonyms: cynical, misanthropic |
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| (adjective) hating mankind in general | Synonyms: misanthropic |
| mithraic | (adjective) of or relating to Mithraism or its god | Synonyms: mithraistic |
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| mithraistic | (adjective) of or relating to Mithraism or its god | Synonyms: mithraic |
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| monolithic | (adjective) imposing in size or bulk or solidity | Synonyms: massive, monumental |
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| (adjective) characterized by massiveness and rigidity and total uniformity | - |
| monotheistic | (adjective) believing that there is only one god | - |
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| monthlong | (adjective) last through a month | - |
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| monthly | (adjective) of or occurring or payable every month | - |
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| motherless | (adjective) having no living or known mother | - |
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| motherlike | (adjective) suggestive of or acting like a mother | - |
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| motherly | (adjective) befitting a mother; warm and nurturing | - |
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| mothproof | (adjective) resistant to damage by moths | Synonyms: moth-resistant |
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| mothy | (adjective) infested with moths | - |
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| (adjective) worn or eaten away by (or as if by) moths | Synonyms: moth-eaten |
| mouthless | (adjective) having no mouth or mouthlike opening | Synonyms: astomatous |
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| mouthlike | (adjective) of an opening that resembles a mouth | - |
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| multiethnic | (adjective) involving several ethnic groups | Synonyms: multi-ethnic |
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| myopathic | (adjective) of or relating to any disease of the muscles that is not caused by nerve dysfunction | - |
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| mythic | (adjective) relating to or having the nature of myth | - |
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| (adjective) based on or told of in traditional stories; lacking factual basis or historical validity | Synonyms: fabulous, mythical, mythologic, mythological |
| mythical | (adjective) based on or told of in traditional stories; lacking factual basis or historical validity | Synonyms: fabulous, mythic, mythologic, mythological |
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| mythologic | (adjective) based on or told of in traditional stories; lacking factual basis or historical validity | Synonyms: fabulous, mythic, mythical, mythological |
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| mythological | (adjective) based on or told of in traditional stories; lacking factual basis or historical validity | Synonyms: fabulous, mythic, mythical, mythologic |
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| neanderthal | (adjective) ill-mannered and coarse and contemptible in behavior or appearance | Synonyms: boorish, loutish, neandertal, oafish, swinish |
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| neither | (adjective) not either; not one or the other; entity, dual, negative pronoun; quantifier, dual, negative | - |
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| neolithic | (adjective) of or relating to the most recent period of the Stone Age (following the mesolithic) | - |
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| nether | (adjective) lower | - |
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| (adjective) dwelling beneath the surface of the earth | Synonyms: chthonian, chthonic |
| (adjective) located below or beneath something else | Synonyms: under |
| nethermost | (adjective) farthest down | Synonyms: bottommost, lowermost |
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| neurasthenic | (adjective) of or relating to or suffering from neurasthenia | - |
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| newsworthy | (adjective) sufficiently interesting to be reported in a newspaper | - |
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| nineteenth | (adjective) coming next after the eighteenth in position | Synonyms: 19th |
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| ninetieth | (adjective) the ordinal number of ninety in counting order | Synonyms: 90th |
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| ninth | (adjective) coming next after the eighth and just before the tenth in position | Synonyms: 9th |
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| nomothetic | (adjective) relating to or involving the search for abstract universal principles | - |
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| nonlethal | (adjective) not capable of causing death | - |
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| nonphotosynthetic | (adjective) not photosynthetic | - |
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| nonrhythmic | (adjective) deliberately not rhythmic | - |
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| nonsynthetic | (adjective) involving or derived from living organisms; free from chemical treatments or additives | - |
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| nonthermal | (adjective) not involving heat | - |
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| north | (adjective) situated in or facing or moving toward or coming from the north | - |
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| northbound | (adjective) moving toward the north | Synonyms: northward |
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| northeast | (adjective) situated in or oriented toward the northeast | Synonyms: northeasterly, northeastern |
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| (adjective) coming from the northeast | Synonyms: northeasterly |
| northeasterly | (adjective) situated in or oriented toward the northeast | Synonyms: northeast, northeastern |
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| (adjective) coming from the northeast | Synonyms: northeast |
| northeastern | (adjective) of a region of the United States generally including the New England states, New York, and sometimes New Jersey and Pennsylvania | - |
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| (adjective) situated in or oriented toward the northeast | Synonyms: northeast, northeasterly |
| northeastward | (adjective) toward the northeast | - |
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| northerly | (adjective) coming from the north; used especially of wind | Synonyms: northern |
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| (adjective) oriented toward the north | Synonyms: northern |
| northern | (adjective) situated in regions of the north | - |
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| (adjective) in or characteristic of a region of the United States north of (approximately) the Mason-Dixon line | - |
| (adjective) coming from the north; used especially of wind | Synonyms: northerly |
| (adjective) oriented toward the north | Synonyms: northerly |
| northernmost | (adjective) situated farthest north | Synonyms: northmost |
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| northmost | (adjective) situated farthest north | Synonyms: northernmost |
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| northward | (adjective) moving toward the north | Synonyms: northbound |
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| northwest | (adjective) situated in or oriented toward the northwest | Synonyms: northwesterly, northwestern |
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| (adjective) coming from the northwest | Synonyms: northwesterly |
| northwesterly | (adjective) situated in or oriented toward the northwest | Synonyms: northwest, northwestern |
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| (adjective) coming from the northwest | Synonyms: northwest |
| northwestern | (adjective) situated in or oriented toward the northwest | Synonyms: northwest, northwesterly |
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| (adjective) of a region of the United States generally including Washington, Oregon, Idaho, and sometimes Montana, Wyoming | - |
| northwestward | (adjective) toward the northwest | - |
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| noteworthy | (adjective) worthy of attention | Synonyms: notable, remarkable |
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| nth | (adjective) last or greatest in an indefinitely large series | Synonyms: n-th |
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| openmouthed | (adjective) with eyes or mouth open in surprise | Synonyms: goggle-eyed, popeyed |
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| ophthalmic | (adjective) of or relating to ophthalmology | - |
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| (adjective) of or relating to or resembling the eye | Synonyms: ocular, optic, optical |
| opisthognathous | (adjective) having receding jaws | - |
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| ornithological | (adjective) of or relating to ornithology | - |
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| orthodontic | (adjective) of or relating to or involving or practicing orthodontics | - |
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| orthodox | (adjective) adhering to what is commonly accepted | - |
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| orthogonal | (adjective) not pertinent to the matter under consideration | Synonyms: extraneous, immaterial, impertinent |
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| (adjective) having a set of mutually perpendicular axes; meeting at right angles | Synonyms: rectangular |
| (adjective) statistically unrelated | - |
| orthographic | (adjective) of or relating to or expressed in orthography | - |
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| orthomolecular | (adjective) designating or relating to a form of treatment of mental disorders that seeks to restore biochemical balance in the body with large doses of vitamins and minerals | - |
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| orthopaedic | (adjective) of or relating to orthopedics | Synonyms: orthopedic, orthopedical |
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| orthopedic | (adjective) of or relating to orthopedics | Synonyms: orthopaedic, orthopedical |
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| orthopedical | (adjective) of or relating to orthopedics | Synonyms: orthopaedic, orthopedic |
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| orthoptic | (adjective) of or relating to normal binocular vision | - |
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| orthostatic | (adjective) pertaining to an upright standing posture | - |
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| orthotropous | (adjective) (of a plant ovule) completely straight with the micropyle at the apex | - |
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| other | (adjective) not the same one or ones already mentioned or implied; quantifier, other | - |
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| (adjective) recently past | - |
| (adjective) very unusual; different in character or quality from the normal or expected | - |
| (adjective) belonging to the distant past | Synonyms: early, former |
| otherwise | (adjective) other than as supposed or expected | - |
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| otherworldly | (adjective) existing outside of or not in accordance with nature | Synonyms: nonnatural, preternatural, transcendental |
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| overenthusiastic | (adjective) unduly enthusiastic | - |
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| palaeolithic | (adjective) of or relating to the second period of the Stone Age (following the eolithic) | Synonyms: paleolithic |
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| paleoanthropological | (adjective) of or concerned with the scientific study of human fossils | - |
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| paleolithic | (adjective) of or relating to the second period of the Stone Age (following the eolithic) | Synonyms: palaeolithic |
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| pantheist | (adjective) of or relating to pantheism | Synonyms: pantheistic |
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| pantheistic | (adjective) of or relating to pantheism | Synonyms: pantheist |
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| parasympathetic | (adjective) of or relating to the parasympathetic nervous system | - |
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| parasympathomimetic | (adjective) having an effect similar to that resulting from stimulation of the parasympathetic nervous system | - |
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| parenthetic | (adjective) qualifying or explaining; placed or as if placed in parentheses | Synonyms: parenthetical |
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| parenthetical | (adjective) qualifying or explaining; placed or as if placed in parentheses | Synonyms: parenthetic |
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| parthenogenetic | (adjective) (of reproduction) not involving the fusion of male and female gametes in reproduction | Synonyms: agamic, agamogenetic, agamous, apomictic |
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| pathetic | (adjective) inspiring mixed contempt and pity | Synonyms: pitiable, pitiful |
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| (adjective) inspiring scornful pity | Synonyms: ridiculous, silly |
| (adjective) deserving or inciting pity | Synonyms: hapless, miserable, misfortunate, piteous, pitiable, pitiful, poor, wretched |
| pathless | (adjective) lacking pathways | Synonyms: roadless, trackless, untracked, untrod, untrodden |
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| pathogenic | (adjective) able to cause disease | Synonyms: infective, morbific |
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| pathologic | (adjective) of or relating to the practice of pathology | Synonyms: pathological |
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| (adjective) caused by or altered by or manifesting disease or pathology | Synonyms: diseased, morbid, pathological |
| pathological | (adjective) of or relating to the practice of pathology | Synonyms: pathologic |
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| (adjective) caused by or evidencing a mentally disturbed condition | - |
| (adjective) caused by or altered by or manifesting disease or pathology | Synonyms: diseased, morbid, pathologic |
| perithelial | (adjective) of or relating to the tissue layer around small blood vessels | - |
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| philanthropic | (adjective) of or relating to or characterized by philanthropy | - |
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| (adjective) generous in assistance to the poor | Synonyms: beneficent, benevolent, eleemosynary |
| photosynthetic | (adjective) relating to or using or formed by photosynthesis | - |
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| physiotherapeutic | (adjective) of or relating to or used in physical therapy | - |
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| pithy | (adjective) concise and full of meaning | Synonyms: sententious |
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| plethoric | (adjective) excessively abundant | Synonyms: overabundant, rife |
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| poikilothermic | (adjective) of animals except birds and mammals; having body temperature that varies with the environment | Synonyms: ectothermic, heterothermic, poikilothermous |
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| poikilothermous | (adjective) of animals except birds and mammals; having body temperature that varies with the environment | Synonyms: ectothermic, heterothermic, poikilothermic |
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| polysynthetic | (adjective) forming derivative or compound words by putting together constituents each of which expresses a single definite meaning | Synonyms: agglutinative |
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