| apolitical | (adjective) politically neutral | Synonyms: unpolitical |
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| apomictical | (adjective) of or relating to a plant that reproduces by apomixis | Synonyms: apomictic |
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| apophyseal | (adjective) of or relating to an apophysis | - |
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| apostolical | (adjective) of or relating to or deriving from the Apostles or their teachings | Synonyms: apostolic |
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| (adjective) proceeding from or ordered by or subject to a pope or the papacy regarded as the successor of the Apostles | Synonyms: apostolic, papal, pontifical |
| apothecial | (adjective) of or relating to the apothecium of some lichens and fungi | - |
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| apothegmatical | (adjective) given to or characterized by terse apothegms | Synonyms: apothegmatic |
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| appalled | (adjective) struck with fear, dread, or consternation | Synonyms: aghast, dismayed, shocked |
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| appalling | (adjective) causing consternation | Synonyms: dismaying |
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| apparitional | (adjective) resembling or characteristic of a phantom | Synonyms: ghostlike, ghostly, phantasmal, spectral, spiritual |
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| appealable | (adjective) capable of being appealed especially to a higher tribunal | - |
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| appealing | (adjective) able to attract interest or draw favorable attention | - |
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| (adjective) (of characters in literature or drama) evoking empathic or sympathetic feelings | Synonyms: likable, likeable, sympathetic |
| appositional | (adjective) relating to or being in apposition | Synonyms: appositive |
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| apsidal | (adjective) of or relating to an apse | - |
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| apteral | (adjective) having columns at one or both ends but not along the sides | - |
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| (adjective) (of insects) without wings | Synonyms: apterous |
| aptitudinal | (adjective) of or relating to aptitudes | - |
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| aquacultural | (adjective) of or relating to aquiculture | Synonyms: aquicultural, hydroponic |
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| aquicultural | (adjective) of or relating to aquiculture | Synonyms: aquacultural, hydroponic |
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| araneidal | (adjective) relating to or resembling a spider | Synonyms: araneidan |
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| arbitral | (adjective) relating to or resulting from arbitration | Synonyms: arbitrational |
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| arbitrational | (adjective) relating to or resulting from arbitration | Synonyms: arbitral |
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| arboreal | (adjective) inhabiting or frequenting trees | Synonyms: arboreous, tree-living |
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| (adjective) of or relating to or formed by trees | Synonyms: arborary, arborical, arborous |
| (adjective) resembling a tree in form and branching structure | Synonyms: arboreous, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, tree-shaped, treelike |
| arborical | (adjective) of or relating to or formed by trees | Synonyms: arborary, arboreal, arborous |
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| archaeological | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archeologic, archeological |
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| archangelical | (adjective) of or relating to or resembling archangels | Synonyms: archangelic |
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| archducal | (adjective) belonging to or befitting an archduke or his archduchy | - |
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| archegonial | (adjective) of or relating to an archegonium | Synonyms: archegoniate |
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| archeological | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archaeological, archeologic |
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| archepiscopal | (adjective) of or associated with an archbishop | Synonyms: archiepiscopal |
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| archesporial | (adjective) of or relating to the cells in a sporangium that give rise to spores | - |
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| archetypal | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypical, prototypal, prototypic, prototypical |
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| archetypical | (adjective) representing or constituting an original type after which other similar things are patterned | Synonyms: archetypal, prototypal, prototypic, prototypical |
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| archidiaconal | (adjective) of or relating to an archdeacon or his office | - |
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| archiepiscopal | (adjective) of or associated with an archbishop | Synonyms: archepiscopal |
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| architectural | (adjective) of or pertaining to the art and science of architecture | - |
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| archival | (adjective) of or relating to or contained in or serving as an archive | - |
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| areal | (adjective) of or relating to or involving an area | - |
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| aristocratical | (adjective) belonging to or characteristic of the nobility or aristocracy | Synonyms: aristocratic, blue-blooded, blue, gentle, patrician |
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| arithmetical | (adjective) relating to or involving arithmetic | Synonyms: arithmetic |
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| armorial | (adjective) of or relating to heraldry or heraldic arms | - |
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| arrhythmical | (adjective) without regard for rhythm | Synonyms: arrhythmic |
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| arsenical | (adjective) relating to or containing arsenic | - |
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| artefactual | (adjective) of or relating to artifacts | Synonyms: artifactual |
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| arterial | (adjective) of or involving or contained in the arteries | - |
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| arthralgic | (adjective) of or relating to arthralgia | - |
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| arthropodal | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodan, arthropodous |
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| artifactual | (adjective) of or relating to artifacts | Synonyms: artefactual |
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| artificial | (adjective) contrived by art rather than nature | Synonyms: unreal |
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| (adjective) artificially formal | Synonyms: contrived, hokey, stilted |
| (adjective) not arising from natural growth or characterized by vital processes | - |
| ascensional | (adjective) tending to rise | - |
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| ascetical | (adjective) pertaining to or characteristic of an ascetic or the practice of rigorous self-discipline | Synonyms: ascetic |
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| (adjective) practicing great self-denial | Synonyms: ascetic, austere, spartan |
| asexual | (adjective) not having or involving sex | Synonyms: nonsexual |
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| asocial | (adjective) given to avoiding association with others | - |
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| (adjective) hostile to or disruptive of normal standards of social behavior | Synonyms: antisocial |
| aspectual | (adjective) of or belonging to an aspect (as an aspect of the verb) | - |
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| asphaltic | (adjective) containing asphalt | - |
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| aspherical | (adjective) varying slightly from a perfectly spherical shape | Synonyms: aspheric |
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| associational | (adjective) of or relating to associations or associationism | - |
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| asterismal | (adjective) relating to asterisms or constellations | - |
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| asternal | (adjective) not connected to the sternum or breastbone | - |
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| asteroidal | (adjective) of or relating to or resembling an asteroid | - |
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| astomatal | (adjective) lacking a stoma or stomata | - |
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| astragalar | (adjective) of or relating to the anklebone | - |
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| astral | (adjective) being or relating to or resembling or emanating from stars | Synonyms: stellar |
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| astrological | (adjective) relating to or concerned with astrology | - |
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| astronautical | (adjective) of or belonging to astronauts or the science of astronautics | Synonyms: astronautic |
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| astronomical | (adjective) relating or belonging to the science of astronomy | Synonyms: astronomic |
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| (adjective) inconceivably large | Synonyms: astronomic, galactic |
| astrophysical | (adjective) of or concerned with astrophysics | - |
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| asymmetrical | (adjective) characterized by asymmetry in the spatial arrangement or placement of parts or components | Synonyms: asymmetric |
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| (adjective) irregular in shape or outline | Synonyms: crooked |
| atheistical | (adjective) related to or characterized by or given to atheism | Synonyms: atheist, atheistic |
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| (adjective) rejecting any belief in gods | Synonyms: atheistic, unbelieving |
| atmospherical | (adjective) relating to or located in the atmosphere | Synonyms: atmospheric |
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| atomistical | (adjective) divided into separate and often disparate elements | Synonyms: atomistic |
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| atonal | (adjective) characterized by avoidance of traditional western tonality | Synonyms: unkeyed |
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| atonalistic | (adjective) of or relating to atonalism | - |
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| atrial | (adjective) of or relating to a cavity or chamber in the body (especially one of the upper chambers of the heart) | - |
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| attentional | (adjective) of or relating to attention | - |
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| attitudinal | (adjective) of or relating to attitudes | - |
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| attritional | (adjective) relating to or caused by attrition | - |
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| atypical | (adjective) not representative of a group, class, or type | Synonyms: atypic, untypical |
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| (adjective) deviating from normal expectations; somewhat odd, strange, or abnormal | Synonyms: irregular |
| auctorial | (adjective) of or by or typical of an author | Synonyms: authorial |
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| audiovisual | (adjective) involving both hearing and seeing (usually relating to teaching aids) | - |
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| aural | (adjective) relating to or characterized by an aura | - |
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| (adjective) of or pertaining to hearing or the ear | - |
| auroral | (adjective) characteristic of the dawn | Synonyms: aurorean |
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| (adjective) of or relating to the atmospheric phenomenon auroras | - |
| austral | (adjective) of the south or coming from the south | - |
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| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| autacoidal | (adjective) of or relating to an autacoid | - |
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| autarchical | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchic, autarkical |
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| autarkical | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchic, autarchical |
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| (adjective) of countries; not relying on imports | Synonyms: autarkic |
| authorial | (adjective) of or by or typical of an author | Synonyms: auctorial |
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| autobiographical | (adjective) relating to or in the style of an autobiography | Synonyms: autobiographic |
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| (adjective) of or relating to or characteristic of an autobiographer | Synonyms: autobiographic |
| autocatalytic | (adjective) relating to or proceeding by autocatalysis | - |
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| autochthonal | (adjective) originating where it is found | Synonyms: autochthonic, autochthonous, endemic, indigenous |
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| autosomal | (adjective) of or relating to an autosome | - |
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| autumnal | (adjective) of or characteristic of or occurring in autumn | - |
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| (adjective) characteristic of late maturity verging on decline | - |
| avifaunal | (adjective) of or relating to birds of a particular region or period | Synonyms: avifaunistic |
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| avocational | (adjective) of or involved in an avocation | - |
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| axial | (adjective) of or relating to or resembling an axis of rotation | - |
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| (adjective) relating to or attached to the axis | Synonyms: axile |
| (adjective) situated on or along or in the direction of an axis | - |
| axiological | (adjective) of or relating to the study of values | - |
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| axiomatical | (adjective) of or relating to or derived from axioms | Synonyms: axiomatic, postulational |
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| axonal | (adjective) of or relating to or resembling an axon | - |
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| azimuthal | (adjective) of or relating to or in azimuth | - |
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| azonal | (adjective) not divided into zones | - |
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| bacchanal | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanalian, bacchic, carousing, orgiastic |
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