| arch | (adjective) naughtily or annoyingly playful | Synonyms: impish, implike, mischievous, pixilated, prankish, puckish, wicked |
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| (adjective) (used of behavior or attitude) characteristic of those who treat others with condescension | Synonyms: condescending, patronising, patronizing |
| archaean | (adjective) of or relating to the earliest known rocks formed during the Precambrian Eon | Synonyms: archean |
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| archaeologic | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeological, archeologic, archeological |
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| archaeological | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archeologic, archeological |
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| archaeozoic | (adjective) of or belonging to earlier of two divisions of the Precambrian era | Synonyms: archeozoic |
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| archaic | (adjective) little evolved from or characteristic of an earlier ancestral type | Synonyms: primitive |
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| (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antediluvian, antiquated |
| archaistic | (adjective) imitative of an archaic style or manner | - |
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| archangelic | (adjective) of or relating to or resembling archangels | Synonyms: archangelical |
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| archangelical | (adjective) of or relating to or resembling archangels | Synonyms: archangelic |
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| archdiocesan | (adjective) of or relating to an archdiocese | - |
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| archducal | (adjective) belonging to or befitting an archduke or his archduchy | - |
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| archean | (adjective) of or relating to the earliest known rocks formed during the Precambrian Eon | Synonyms: archaean |
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| arched | (adjective) constructed with or in the form of an arch or arches | - |
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| (adjective) forming or resembling an arch | Synonyms: arced, arching, arciform, arcuate, bowed |
| archegonial | (adjective) of or relating to an archegonium | Synonyms: archegoniate |
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| archegoniate | (adjective) of or relating to an archegonium | Synonyms: archegonial |
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| archeologic | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archaeological, archeological |
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| archeological | (adjective) related to or dealing with or devoted to archaeology | Synonyms: archaeologic, archaeological, archeologic |
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| archeozoic | (adjective) of or belonging to earlier of two divisions of the Precambrian era | Synonyms: archaeozoic |
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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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| arching | (adjective) forming or resembling an arch | Synonyms: arced, arched, arciform, arcuate, bowed |
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| archipelagic | (adjective) relating to or part of an archipelago | - |
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| architectonic | (adjective) of or pertaining to construction or architecture | Synonyms: tectonic |
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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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| archosaurian | (adjective) of or relating to reptiles of the subclass Archosauria | - |
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| arithmetic | (adjective) relating to or involving arithmetic | Synonyms: arithmetical |
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| arithmetical | (adjective) relating to or involving arithmetic | Synonyms: arithmetic |
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| arrhythmic | (adjective) without regard for rhythm | Synonyms: arrhythmical |
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| (adjective) lacking a steady rhythm | Synonyms: jerking, jerky |
| arrhythmical | (adjective) without regard for rhythm | Synonyms: arrhythmic |
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| arthralgic | (adjective) of or relating to arthralgia | - |
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| arthritic | (adjective) of or pertaining to arthritis | Synonyms: creaky, rheumatic, rheumatoid, rheumy |
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| arthromeric | (adjective) of or relating to one of the body segments of jointed animals | - |
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| arthropodal | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodan, arthropodous |
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| arthropodan | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodous |
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| arthropodous | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodan |
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| arthrosporic | (adjective) of or relating to arthrospores | Synonyms: arthrosporous |
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| arthrosporous | (adjective) of or relating to arthrospores | Synonyms: arthrosporic |
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| ashamed | (adjective) feeling shame or guilt or embarrassment or remorse | - |
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| ashen | (adjective) anemic looking from illness or emotion | Synonyms: blanched, bloodless, livid, white |
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| (adjective) made of wood of the ash tree | - |
| ashy | (adjective) of a light grey | Synonyms: ash-gray, ash-grey |
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| asphaltic | (adjective) containing asphalt | - |
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| aspheric | (adjective) varying slightly from a perfectly spherical shape | Synonyms: aspherical |
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| aspherical | (adjective) varying slightly from a perfectly spherical shape | Synonyms: aspheric |
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| asphyxiated | (adjective) in a state of asphyxia | - |
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| asphyxiating | (adjective) tending to deprive of oxygen | - |
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| asthenic | (adjective) having a slender physique | - |
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| (adjective) lacking energy or vitality | Synonyms: adynamic, debilitated, enervated |
| asthmatic | (adjective) relating to breathing with a whistling sound | Synonyms: wheezing, wheezy |
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| astonished | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: amazed, astonied, astounded, stunned |
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| astonishing | (adjective) so surprisingly impressive as to stun or overwhelm | Synonyms: astounding, staggering, stupefying |
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| (adjective) surprising greatly | Synonyms: amazing |
| astrophysical | (adjective) of or concerned with astrophysics | - |
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| asynchronous | (adjective) not synchronous; not occurring or existing at the same time or having the same period or phase | - |
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| (adjective) (digital communication) pertaining to a transmission technique that does not require a common clock between the communicating devices; timing signals are derived from special characters in the data stream itself | - |
| atheist | (adjective) related to or characterized by or given to atheism | Synonyms: atheistic, atheistical |
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| atheistic | (adjective) related to or characterized by or given to atheism | Synonyms: atheist, atheistical |
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| (adjective) rejecting any belief in gods | Synonyms: atheistical, unbelieving |
| 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 |
| atheromatic | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatous |
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| atheromatous | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatic |
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| atherosclerotic | (adjective) of or relating to atherosclerosis | - |
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| athirst | (adjective) (usually followed by `for') extremely desirous | Synonyms: hungry, thirsty |
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| athletic | (adjective) relating to or befitting athletics or athletes | - |
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| (adjective) vigorously active | Synonyms: acrobatic, gymnastic |
| (adjective) having a sturdy and well proportioned body | - |
| atmospheric | (adjective) relating to or located in the atmosphere | Synonyms: atmospherical |
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| atmospherical | (adjective) relating to or located in the atmosphere | Synonyms: atmospheric |
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| atrophic | (adjective) relating to or characterized by atrophy | - |
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| atrophied | (adjective) (of an organ or body part) diminished in size or strength as a result of disease or injury or lack of use | Synonyms: diminished, wasted |
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| attachable | (adjective) capable of being fastened or added to something else | - |
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| attached | (adjective) associated in an exclusive sexual relationship | Synonyms: committed |
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| (adjective) used of buildings joined by common sidewalls | - |
| (adjective) fond and affectionate | - |
| (adjective) being joined in close association | Synonyms: affiliated, connected |
| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| autarchic | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchical, autarkical |
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| autarchical | (adjective) of or relating to or characterized by autarchy | Synonyms: autarchic, autarkical |
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| authentic | (adjective) not counterfeit or copied | Synonyms: bona fide, unquestionable, veritable |
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| (adjective) conforming to fact and therefore worthy of belief | Synonyms: reliable |
| authenticated | (adjective) established as genuine | Synonyms: attested, documented |
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| authorial | (adjective) of or by or typical of an author | Synonyms: auctorial |
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| authorised | (adjective) endowed with authority | Synonyms: authoritative, authorized |
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| authoritarian | (adjective) expecting unquestioning obedience | Synonyms: dictatorial, overbearing |
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| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: autocratic, despotic, dictatorial, tyrannic, tyrannical |
| authoritative | (adjective) endowed with authority | Synonyms: authorised, authorized |
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| (adjective) having authority or ascendancy or influence | Synonyms: important |
| (adjective) of recognized authority or excellence | Synonyms: definitive |
| authorized | (adjective) endowed with authority | Synonyms: authorised, authoritative |
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| autobiographic | (adjective) relating to or in the style of an autobiography | Synonyms: autobiographical |
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| (adjective) of or relating to or characteristic of an autobiographer | Synonyms: autobiographical |
| 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 |
| autochthonal | (adjective) originating where it is found | Synonyms: autochthonic, autochthonous, endemic, indigenous |
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| autochthonic | (adjective) originating where it is found | Synonyms: autochthonal, autochthonous, endemic, indigenous |
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| autochthonous | (adjective) of rocks, deposits, etc.; found where they and their constituents were formed | - |
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| (adjective) originating where it is found | Synonyms: autochthonal, autochthonic, endemic, indigenous |
| autographed | (adjective) bearing an autograph | - |
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| autographic | (adjective) written in the author's own handwriting | - |
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| autophytic | (adjective) of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis | Synonyms: autotrophic |
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| autoradiographic | (adjective) of or relating to or produced by autoradiography | - |
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| autotrophic | (adjective) of or relating to organisms (as green plants) that can make complex organic nutritive compounds from simple inorganic sources by photosynthesis | Synonyms: autophytic |
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| awash | (adjective) covered with water | Synonyms: afloat, flooded, inundated, overflowing |
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| aweigh | (adjective) (of an anchor) just clear of the bottom | Synonyms: atrip |
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| (adjective) (used of an anchor) hanging clear of the bottom | - |
| awheel | (adjective) traveling by wheeled vehicle such as bicycle or automobile e.g. | - |
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| azimuthal | (adjective) of or relating to or in azimuth | - |
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| baboonish | (adjective) resembling a baboon | - |
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| babyish | (adjective) characteristic of a baby | - |
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| bacchanal | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanalian, bacchic, carousing, orgiastic |
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| bacchanalian | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanal, bacchic, carousing, orgiastic |
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| bacchantic | (adjective) of or relating to or resembling a bacchanalian reveler | - |
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| bacchic | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanal, bacchanalian, carousing, orgiastic |
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