| spectrographic | (adjective) relating to or employing a spectrograph | - |
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| spectrometric | (adjective) of or relating to or involving spectrometry | - |
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| spectroscopic | (adjective) of or relating to or involving spectroscopy | Synonyms: spectroscopical |
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| spectroscopical | (adjective) of or relating to or involving spectroscopy | Synonyms: spectroscopic |
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| subject | (adjective) likely to be affected by something | - |
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| (adjective) being under the power or sovereignty of another or others | Synonyms: dependent |
| (adjective) possibly accepting or permitting | Synonyms: capable, open |
| subjective | (adjective) taking place within the mind and modified by individual bias | - |
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| (adjective) of a mental act performed entirely within the mind | Synonyms: immanent |
| suspect | (adjective) not as expected | Synonyms: fishy, funny, shady, suspicious |
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| suspected | (adjective) believed likely | - |
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| tectonic | (adjective) pertaining to the structure or movement of the earth's crust | - |
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| (adjective) of or pertaining to construction or architecture | Synonyms: architectonic |
| thermoelectric | (adjective) involving or resulting from thermoelectricity | Synonyms: thermoelectrical |
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| thermoelectrical | (adjective) involving or resulting from thermoelectricity | Synonyms: thermoelectric |
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| unaffected | (adjective) undergoing no change when acted upon | - |
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| (adjective) free of artificiality; sincere and genuine | - |
| (adjective) emotionally unmoved | Synonyms: unmoved, untouched |
| (adjective) unaware of or indifferent to | Synonyms: insensible |
| unaffecting | (adjective) not arousing affect | - |
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| unaffectionate | (adjective) lacking affection or warm feeling | Synonyms: detached, uncaring |
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| uncollected | (adjective) not brought together in one place | Synonyms: ungathered |
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| uncollectible | (adjective) not capable of being collected | Synonyms: bad |
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| unconnected | (adjective) not joined or linked together | - |
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| (adjective) lacking orderly continuity | Synonyms: confused, disconnected, disjointed, disordered, garbled, illogical, scattered |
| (adjective) not connected by birth or family | - |
| uncorrectable | (adjective) incapable of being controlled or managed | Synonyms: uncontrollable, unmanageable |
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| uncorrected | (adjective) left faulty or wrong | - |
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| (adjective) not subjected to correction or discipline | Synonyms: undisciplined |
| undetectable | (adjective) barely able to be perceived | Synonyms: indiscernible, insensible |
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| (adjective) not easily seen | - |
| undetected | (adjective) not perceived or discerned | - |
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| undirected | (adjective) aimlessly drifting | Synonyms: adrift, afloat, aimless, directionless, planless, rudderless |
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| uneffective | (adjective) not producing an intended effect | Synonyms: ineffective, ineffectual |
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| unerect | (adjective) not upright in position or posture | - |
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| unexpected | (adjective) not expected or anticipated | - |
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| unidirectional | (adjective) operating or moving or allowing movement in one direction only | - |
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| uninfected | (adjective) free from sepsis or infection | Synonyms: clean |
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| uninflected | (adjective) (of the voice) not inflected | - |
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| (adjective) not inflected | - |
| (adjective) expressing a grammatical category by using two or more words rather than inflection | Synonyms: analytic |
| uninjectable | (adjective) (used of drugs) not capable of being injected | - |
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| unobjectionable | (adjective) (of behavior or especially language) free from objectionable elements; fit for all observers | Synonyms: clean |
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| (adjective) not objectionable | - |
| (adjective) not causing disapproval | Synonyms: innocuous |
| unobjective | (adjective) (of e.g. evidence) not objective or easily verified | Synonyms: unverifiable |
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| unprotected | (adjective) lacking protection or defense | - |
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| unprotective | (adjective) not affording protection | - |
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| unreflected | (adjective) (especially of incident sound or light) not turned back by physical reflection | - |
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| unreflective | (adjective) not exhibiting or characterized by careful thought | Synonyms: unthinking, unthoughtful |
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| unrespectable | (adjective) unworthy of respect | - |
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| unsectarian | (adjective) not restricted to one sect or school or party | Synonyms: nonsectarian |
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| unselected | (adjective) not selected | - |
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| unselective | (adjective) not selective or discriminating | - |
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| unspectacular | (adjective) not spectacular | - |
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| unsuspected | (adjective) not suspected or believed likely | - |
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| unsuspecting | (adjective) not suspicious | Synonyms: unsuspicious |
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| (adjective) (often followed by `of') not knowing or expecting; not thinking likely | - |