| supercritical | (adjective) (especially of fissionable material) able to sustain a chain reaction in such a manner that the rate of reaction increases | - |
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| supererogatory | (adjective) more than is needed, desired, or required | Synonyms: excess, extra, redundant, spare, superfluous, supernumerary, surplus |
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| superfatted | (adjective) (of soap) containing extra unsaponified fat | - |
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| superficial | (adjective) concerned with or comprehending only what is apparent or obvious; not deep or penetrating emotionally or intellectually | - |
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| (adjective) of, affecting, or being on or near the surface | - |
| (adjective) hasty and without attention to detail; not thorough | Synonyms: casual, cursory, passing, perfunctory |
| (adjective) of little substance or significance | Synonyms: trivial |
| (adjective) occurring on or near the surface of the skin | - |
| superfine | (adjective) (used especially of merchandise) very fine in quality | - |
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| (adjective) of extremely fine size or texture | - |
| (adjective) excessively delicate or refined | Synonyms: overrefined |
| superfluous | (adjective) more than is needed, desired, or required | Synonyms: excess, extra, redundant, spare, supererogatory, supernumerary, surplus |
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| (adjective) serving no useful purpose; having no excuse for being | Synonyms: otiose, pointless, purposeless, senseless, wasted |
| superhuman | (adjective) above or beyond the human or demanding more than human power or endurance | - |
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| superimposed | (adjective) with one layer on top of another | Synonyms: layered |
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| (adjective) placed on or over something else | Synonyms: overlying |
| superincumbent | (adjective) lying or resting on and exerting pressure on something else | - |
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| superior | (adjective) written or printed above and to one side of another character | Synonyms: superscript |
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| (adjective) of or characteristic of high rank or importance | - |
| (adjective) of high or superior quality or performance | - |
| (adjective) having an orbit farther from the sun than the Earth's orbit | - |
| (adjective) (sometimes followed by `to') not subject to or influenced by | - |
| (adjective) having a higher rank | Synonyms: higher-ranking, ranking |
| (adjective) (often followed by `to') above being affected or influenced by | - |
| superjacent | (adjective) lying immediately above or on something else | - |
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| superlative | (adjective) highest in quality | Synonyms: greatest, sterling |
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| superlunar | (adjective) situated beyond the moon or its orbit around the earth | Synonyms: superlunary, translunar, translunary |
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| (adjective) unworldly or ethereal | Synonyms: superlunary, translunar, translunary |
| superlunary | (adjective) situated beyond the moon or its orbit around the earth | Synonyms: superlunar, translunar, translunary |
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| (adjective) unworldly or ethereal | Synonyms: superlunar, translunar, translunary |
| supernal | (adjective) being or coming from on high | - |
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| (adjective) of heaven or the spirit | Synonyms: celestial, ethereal |
| supernatant | (adjective) of a liquid; floating on the surface above a sediment or precipitate | - |
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| supernatural | (adjective) not existing in nature or subject to explanation according to natural laws; not physical or material | - |
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| supernaturalist | (adjective) of or relating to supernaturalism | Synonyms: supernaturalistic |
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| supernaturalistic | (adjective) of or relating to supernaturalism | Synonyms: supernaturalist |
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| supernormal | (adjective) exceeding the normal or average | - |
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| (adjective) beyond the range of the normal or scientifically explainable | Synonyms: supranormal |
| supernumerary | (adjective) more than is needed, desired, or required | Synonyms: excess, extra, redundant, spare, supererogatory, superfluous, surplus |
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| superordinate | (adjective) of higher rank or status or value | - |
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| superpatriotic | (adjective) fanatically patriotic | Synonyms: chauvinistic, flag-waving, jingoistic, nationalistic, ultranationalistic |
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| superposable | (adjective) coinciding exactly when superimposed | Synonyms: identical |
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| supersaturated | (adjective) being more concentrated than normally possible and therefore not in equilibrium | - |
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| superscript | (adjective) written or printed above and to one side of another character | Synonyms: superior |
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| supersensitised | (adjective) having an allergy or peculiar or excessive susceptibility (especially to a specific factor) | Synonyms: allergic, hypersensitised, hypersensitive, hypersensitized, sensitised, sensitized, supersensitive, supersensitized |
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| supersensitive | (adjective) having an allergy or peculiar or excessive susceptibility (especially to a specific factor) | Synonyms: allergic, hypersensitised, hypersensitive, hypersensitized, sensitised, sensitized, supersensitised, supersensitized |
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| supersensitized | (adjective) having an allergy or peculiar or excessive susceptibility (especially to a specific factor) | Synonyms: allergic, hypersensitised, hypersensitive, hypersensitized, sensitised, sensitized, supersensitised, supersensitive |
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| supersonic | (adjective) (of speed) greater than the speed of sound in a given medium (especially air) | - |
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| (adjective) having frequencies above those of audible sound | Synonyms: ultrasonic |
| superstitious | (adjective) showing ignorance of the laws of nature and faith in magic or chance | - |
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| supervised | (adjective) under observation or under the direction of a superintendent or overseer | - |
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| supervisory | (adjective) of or limited to or involving supervision | - |
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| supperless | (adjective) without supper | - |
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| tapered | (adjective) becoming gradually narrower | Synonyms: narrowing, tapering |
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| tapering | (adjective) gradually decreasing until little remains | Synonyms: dwindling, tapering off |
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| (adjective) becoming gradually narrower | Synonyms: narrowing, tapered |
| temperamental | (adjective) relating to or caused by temperament | - |
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| (adjective) subject to sharply varying moods | Synonyms: moody |
| (adjective) likely to perform unpredictably | Synonyms: erratic |
| temperate | (adjective) not extreme in behavior | - |
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| (adjective) (of weather or climate) free from extremes; mild; or characteristic of such weather or climate | - |
| (adjective) not extreme | Synonyms: moderate |
| tempered | (adjective) adjusted or attuned by adding a counterbalancing element | - |
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| (adjective) made hard or flexible or resilient especially by heat treatment | Synonyms: hardened, toughened, treated |
| tempering | (adjective) moderating by making more temperate | - |
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| uncooperative | (adjective) unwilling to cooperate | - |
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| (adjective) intentionally unaccommodating | Synonyms: disobliging |
| unhampered | (adjective) not held in check or subject to control | - |
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| (adjective) not slowed or blocked or interfered with | Synonyms: unhindered |
| unperceivable | (adjective) impossible or difficult to perceive by the mind or senses | Synonyms: imperceptible |
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| unperceived | (adjective) not perceived or commented on | Synonyms: unremarked |
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| unperceiving | (adjective) lacking perception | Synonyms: unperceptive |
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| unperceptive | (adjective) lacking perception | Synonyms: unperceiving |
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| (adjective) lacking sensitivity, taste, or judgment | - |
| unperformed | (adjective) not performed | - |
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| unpermed | (adjective) not having had a permanent wave | - |
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| unpermissive | (adjective) not inclined to grant permission; severe in discipline | - |
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| unperplexed | (adjective) experiencing no difficulty or confusion or bewilderment | - |
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| unpersuadable | (adjective) not susceptible to persuasion | Synonyms: unsuasible |
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| unpersuaded | (adjective) not converted | Synonyms: unconverted |
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| unpersuasive | (adjective) not capable of persuading | - |
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| unperturbed | (adjective) free from emotional agitation or nervous tension | Synonyms: unflurried, unflustered, unruffled |
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| unstoppered | (adjective) (of a container) having the stopper removed | - |
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| unsupervised | (adjective) not supervised or under constant observation | - |
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| untempered | (adjective) not moderated or controlled | - |
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| (adjective) not brought to a proper consistency or hardness | Synonyms: unhardened |
| upper | (adjective) the topmost one of two; upper | - |
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| (adjective) higher in place or position | - |
| (adjective) superior in rank or accomplishment | - |
| uppercase | (adjective) relating to capital letters which were kept in the top half of a compositor's type case | - |
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| uppermost | (adjective) at or nearest to the top | Synonyms: topmost, upmost |
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| vituperative | (adjective) marked by harshly abusive criticism | Synonyms: scathing |
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| whispered | (adjective) spoken in soft hushed tones without vibrations of the vocal cords | - |
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| whispering | (adjective) making a low continuous indistinct sound | Synonyms: murmuring, susurrant |
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