| omnipotent | (adjective) having unlimited power | Synonyms: all-powerful, almighty |
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| orotund | (adjective) (of sounds) full and rich | Synonyms: pear-shaped, rotund, round |
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| (adjective) ostentatiously lofty in style | Synonyms: bombastic, declamatory, large, tumid, turgid |
| orthotropous | (adjective) (of a plant ovule) completely straight with the micropyle at the apex | - |
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| osmotic | (adjective) of or relating to osmosis | - |
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| otc | (adjective) (of securities) not traded on a stock exchange | Synonyms: over-the-counter |
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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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| otic | (adjective) of or relating to near the ear | Synonyms: auricular |
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| otiose | (adjective) disinclined to work or exertion | Synonyms: faineant, indolent, lazy, slothful, work-shy |
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| (adjective) producing no result or effect | Synonyms: futile, ineffectual, meaningless, unavailing |
| (adjective) serving no useful purpose; having no excuse for being | Synonyms: pointless, purposeless, senseless, superfluous, wasted |
| ototoxic | (adjective) toxic to the organs of hearing or balance or to the auditory nerve | - |
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| overemotional | (adjective) excessively or abnormally emotional | Synonyms: sloppy |
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| overprotective | (adjective) overly protective | - |
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| overshot | (adjective) having an upper part projecting beyond the lower | - |
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| parotid | (adjective) relating to or located near the parotid gland | - |
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| parrotlike | (adjective) mechanically imitated or repeated without thought or understanding | - |
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| patriotic | (adjective) inspired by love for your country | Synonyms: loyal |
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| phenotypic | (adjective) of or relating to or constituting a phenotype | Synonyms: phenotypical |
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| phenotypical | (adjective) of or relating to or constituting a phenotype | Synonyms: phenotypic |
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| photic | (adjective) of or relating to or caused by light | - |
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| photochemical | (adjective) of or relating to or produced by the effects of light on chemical systems | - |
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| photoconductive | (adjective) of or relating to photoconductivity | - |
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| photoelectric | (adjective) of or pertaining to photoelectricity | Synonyms: photoelectrical |
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| photoelectrical | (adjective) of or pertaining to photoelectricity | Synonyms: photoelectric |
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| photoemissive | (adjective) of or relating to photoemission | - |
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| photogenic | (adjective) looking attractive in photographs | - |
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| photographic | (adjective) relating to photography or obtained by using photography | - |
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| (adjective) representing people or nature with the exactness and fidelity of a photograph | - |
| photomechanical | (adjective) of or relating to or involving various methods of using photography to make plates for printing | - |
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| photometric | (adjective) of or relating to photometry | Synonyms: photometrical |
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| photometrical | (adjective) of or relating to photometry | Synonyms: photometric |
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| photosensitive | (adjective) sensitive to visible light | Synonyms: light-sensitive |
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| photosynthetic | (adjective) relating to or using or formed by photosynthesis | - |
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| photovoltaic | (adjective) producing a voltage when exposed to radiant energy (especially light) | - |
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| physiotherapeutic | (adjective) of or relating to or used in physical therapy | - |
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| pilotless | (adjective) lacking a pilot | - |
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| pivotal | (adjective) being of crucial importance | Synonyms: polar |
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| plotted | (adjective) with planning and intention | Synonyms: aforethought, planned |
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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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| polyglot | (adjective) having a command of or composed in many languages | - |
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| potable | (adjective) suitable for drinking | Synonyms: drinkable |
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| potbellied | (adjective) having a large belly | Synonyms: abdominous, paunchy |
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| potbound | (adjective) (of a potted plant) grown too large for its container resulting in matting or tangling of the roots | Synonyms: rootbound |
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| potent | (adjective) having a strong physiological or chemical effect | Synonyms: stiff, strong |
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| (adjective) (of a male) capable of copulation | Synonyms: virile |
| (adjective) having great influence | Synonyms: powerful |
| (adjective) having or wielding force or authority | Synonyms: strong |
| potential | (adjective) existing in possibility | Synonyms: possible |
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| (adjective) expected to become or be; in prospect | Synonyms: likely |
| potholed | (adjective) used of paved surfaces having holes or pits | Synonyms: pocked, pockmarked |
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| potted | (adjective) of plants; planted or grown in a pot | - |
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| (adjective) (British informal) summarized or abridged | - |
| (adjective) preserved in a pot or can or jar | - |
| potty | (adjective) slightly intoxicated | Synonyms: tiddly, tipsy |
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| (adjective) marked by foolish or unreasoning fondness | Synonyms: enamored, in love, infatuated, smitten, soft on, taken with |
| (adjective) (British informal) trivial | - |
| procaryotic | (adjective) having cells that lack membrane-bound nuclei | Synonyms: prokaryotic |
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| prokaryotic | (adjective) having cells that lack membrane-bound nuclei | Synonyms: procaryotic |
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| promotional | (adjective) of or relating to serving as publicity | - |
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| (adjective) of or relating to advancement | - |
| promotive | (adjective) tending to further or encourage | - |
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| protanopic | (adjective) inability to see the color red or to distinguish red and bluish-green | Synonyms: red-blind |
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| protean | (adjective) taking on different forms | - |
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| protected | (adjective) kept safe or defended from danger or injury or loss | - |
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| (adjective) guarded from injury or destruction | Synonyms: saved |
| protecting | (adjective) shielding (or designed to shield) against harm or discomfort | - |
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| protective | (adjective) intended or adapted to afford protection of some kind | - |
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| (adjective) showing care | - |
| (adjective) (usually followed by `of') solicitously caring or mindful | - |
| proteinaceous | (adjective) relating to or of the nature of protein | - |
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| proteolytic | (adjective) of or relating to proteolysis | - |
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| proterozoic | (adjective) formed in the later of two divisions of the Precambrian era | - |
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| protestant | (adjective) protesting | - |
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| proto | (adjective) indicating the first or earliest or original | - |
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| protogeometric | (adjective) characteristic of the earliest phase of geometric art especially in Greece | - |
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| prototypal | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypal, archetypical, prototypic, prototypical |
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| prototypic | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypal, archetypical, prototypal, prototypical |
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| prototypical | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypal, archetypical, prototypal, prototypic |
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| protozoal | (adjective) of or relating to the Protozoa | Synonyms: protozoan, protozoic |
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| protozoan | (adjective) of or relating to the Protozoa | Synonyms: protozoal, protozoic |
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| protozoic | (adjective) of or relating to the Protozoa | Synonyms: protozoal, protozoan |
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| protozoological | (adjective) concerning the branch of zoology that studies protozoans | - |
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| protracted | (adjective) relatively long in duration; tediously protracted | Synonyms: drawn-out, extended, lengthy, prolonged |
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| protractible | (adjective) able to be extended | Synonyms: protractile |
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| protractile | (adjective) able to be extended | Synonyms: protractible |
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| protruding | (adjective) extending out above or beyond a surface or boundary | Synonyms: jutting, projected, projecting, relieved, sticking, sticking out |
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| protrusible | (adjective) capable of being thrust forward, as the tongue | Synonyms: protrusile |
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| protrusile | (adjective) capable of being thrust forward, as the tongue | Synonyms: protrusible |
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| protrusive | (adjective) thrusting outward | - |
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| protuberant | (adjective) curving outward | Synonyms: bellied, bellying, bulbous, bulging, bulgy |
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| psychomotor | (adjective) of or relating to or characterizing mental events that have motor consequences or vice versa | - |
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| psychoneurotic | (adjective) affected with emotional disorder | Synonyms: neurotic |
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| psychotherapeutic | (adjective) of or relating to or practicing psychotherapy | - |
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| (adjective) emotionally purging | Synonyms: cathartic |
| psychotic | (adjective) characteristic of or suffering from psychosis | - |
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| psychotropic | (adjective) affecting the mind or mood or other mental processes | Synonyms: psychoactive |
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| pycnotic | (adjective) of or relating to or exhibiting pyknosis | Synonyms: pyknotic |
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| pyknotic | (adjective) of or relating to or exhibiting pyknosis | Synonyms: pycnotic |
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| pyrotechnic | (adjective) of or relating to the craft of making fireworks | Synonyms: pyrotechnical |
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| (adjective) suggestive of fireworks | - |
| pyrotechnical | (adjective) of or relating to the craft of making fireworks | Synonyms: pyrotechnic |
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| quixotic | (adjective) not sensible about practical matters; idealistic and unrealistic | Synonyms: romantic, wild-eyed |
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| quotable | (adjective) able or fit to be repeated or quoted | Synonyms: repeatable |
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| (adjective) suitable for or worthy of quotation | - |
| quotidian | (adjective) found in the ordinary course of events | Synonyms: everyday, mundane, routine, unremarkable, workaday |
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| radiotelephonic | (adjective) relating to or by means of radiotelephony | Synonyms: radiophonic |
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| remote | (adjective) far apart in relevance or relationship or kinship | Synonyms: distant |
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| (adjective) inaccessible and sparsely populated | Synonyms: outback |
| (adjective) unlikely to occur | Synonyms: outside |
| (adjective) located far away spatially | Synonyms: distant |
| (adjective) separate or apart in time | Synonyms: distant, removed |
| riotous | (adjective) produced or growing in extreme abundance | Synonyms: exuberant, lush, luxuriant, profuse |
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| (adjective) unrestrained by convention or morality | Synonyms: debauched, degenerate, degraded, dissipated, dissolute, fast, libertine, profligate |
| (adjective) characterized by unrest or disorder or insubordination | Synonyms: disruptive, troubled, tumultuous, turbulent |
| robotic | (adjective) of or relating to mechanical robots | - |
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| (adjective) resembling the unthinking functioning of a machine | Synonyms: automatic, automatonlike, machinelike, robotlike |
| robotlike | (adjective) resembling the unthinking functioning of a machine | Synonyms: automatic, automatonlike, machinelike, robotic |
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| rootbound | (adjective) having the roots matted or densely tangled | - |
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| (adjective) (of a potted plant) grown too large for its container resulting in matting or tangling of the roots | Synonyms: potbound |
| rooted | (adjective) absolutely still | Synonyms: frozen, stock-still |
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| rootless | (adjective) wandering aimlessly without ties to a place or community | Synonyms: vagabond |
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| rotary | (adjective) relating to or characterized by rotation | - |
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| (adjective) describing a circle; moving in a circle | Synonyms: circular, orbitual |
| rotatable | (adjective) capable of being rotated | - |
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