| artless | (adjective) simple and natural; without cunning or deceit | - |
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| (adjective) characterized by an inability to mask your feelings; not devious | Synonyms: ingenuous |
| (adjective) (of persons) lacking art or knowledge | Synonyms: uncultivated, uncultured |
| (adjective) showing lack of art | - |
| ascendable | (adjective) capable of being ascended | Synonyms: ascendible, climbable |
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| ascendible | (adjective) capable of being ascended | Synonyms: ascendable, climbable |
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| ascensional | (adjective) tending to rise | - |
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| ascertainable | (adjective) capable of being ascertained or found out | Synonyms: discoverable |
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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 |
| asclepiadaceous | (adjective) of or relating to plants of the milkweed family | - |
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| ascribable | (adjective) capable of being assigned or credited to | Synonyms: due, imputable, referable |
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| asexual | (adjective) not having or involving sex | Synonyms: nonsexual |
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| aslant | (adjective) having an oblique or slanted direction | Synonyms: aslope, diagonal, slanted, slanting, sloped, sloping |
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| asleep | (adjective) in a state of sleep | - |
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| (adjective) dead | Synonyms: at peace, at rest, deceased, departed, gone |
| (adjective) lacking sensation | Synonyms: benumbed, numb |
| aslope | (adjective) having an oblique or slanted direction | Synonyms: aslant, diagonal, slanted, slanting, sloped, sloping |
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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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| assailable | (adjective) not defended or capable of being defended | Synonyms: open, undefendable, undefended |
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| assaultive | (adjective) disposed to attack | Synonyms: attacking |
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| assertable | (adjective) capable of being affirmed or asserted | Synonyms: affirmable |
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| assessable | (adjective) capable of being considered carefully | - |
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| (adjective) capable of being assessed especially for the purpose of taxation | - |
| assignable | (adjective) legally transferable to the ownership of another | Synonyms: conveyable, negotiable, transferable, transferrable |
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| assimilable | (adjective) able to be absorbed and incorporated into body tissues | - |
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| assimilating | (adjective) capable of taking (gas, light, or liquids) into a solution | Synonyms: assimilative, assimilatory |
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| assimilative | (adjective) capable of taking (gas, light, or liquids) into a solution | Synonyms: assimilating, assimilatory |
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| (adjective) capable of mentally absorbing | - |
| assimilatory | (adjective) capable of taking (gas, light, or liquids) into a solution | Synonyms: assimilating, assimilative |
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| associable | (adjective) capable of being associated | - |
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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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| astylar | (adjective) lacking columns or pillars | - |
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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 |
| ateleiotic | (adjective) of or relating to ateleiosis | - |
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| 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 |
| atherosclerotic | (adjective) of or relating to atherosclerosis | - |
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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 | - |
| atilt | (adjective) departing or being caused to depart from the true vertical or horizontal | Synonyms: canted, leaning, tilted, tipped |
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| 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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| atrabilious | (adjective) irritable as if suffering from indigestion | Synonyms: bilious, dyspeptic, liverish |
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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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| atrioventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: auriculoventricular |
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| attachable | (adjective) capable of being fastened or added to something else | - |
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| attainable | (adjective) capable of being attained or accomplished | Synonyms: come-at-able |
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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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| attractable | (adjective) capable of being magnetized or attracted by a magnet | - |
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| attributable | (adjective) capable of being attributed | - |
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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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| audible | (adjective) heard or perceptible by the ear | Synonyms: hearable |
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| audile | (adjective) of or relating to the process of hearing | Synonyms: auditive, auditory |
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| audiovisual | (adjective) involving both hearing and seeing (usually relating to teaching aids) | - |
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| auld | (adjective) a Scottish word | - |
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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 | - |
| auricular | (adjective) of or relating to near the ear | Synonyms: otic |
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| (adjective) pertaining to an auricle of the heart | - |
| (adjective) relating to or perceived by or shaped like the organ of hearing | - |
| auriculate | (adjective) having auricles | Synonyms: auriculated |
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| auriculated | (adjective) having auricles | Synonyms: auriculate |
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| auriculoventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: atrioventricular |
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| auroral | (adjective) characteristic of the dawn | Synonyms: aurorean |
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| (adjective) of or relating to the atmospheric phenomenon auroras | - |
| auscultatory | (adjective) of or relating to auscultation | - |
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| 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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| autofluorescent | (adjective) emitting light via self-induced fluorescence | - |
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| autoloading | (adjective) (of firearms) capable of automatic loading and firing continuously | Synonyms: self-loading, semiautomatic |
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| autologous | (adjective) derived from organisms of the selfsame individual | - |
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| autolytic | (adjective) of or relating to self-digestion | - |
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| automatonlike | (adjective) resembling the unthinking functioning of a machine | Synonyms: automatic, machinelike, robotic, robotlike |
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| autoplastic | (adjective) of or relating to or involved in autoplasty | - |
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| autosomal | (adjective) of or relating to an autosome | - |
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| autotelic | (adjective) of or relating to or believing in autotelism | - |
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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 | - |
| auxiliary | (adjective) functioning in a supporting capacity | Synonyms: subsidiary, supplemental, supplementary |
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| (adjective) furnishing added support | Synonyms: accessory, adjunct, adjuvant, ancillary, appurtenant |
| available | (adjective) obtainable or accessible and ready for use or service | - |
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| (adjective) convenient for use or disposal | Synonyms: usable, useable |
| (adjective) not busy; not otherwise committed | Synonyms: uncommitted |
| avascular | (adjective) without blood vessels | - |
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| avellan | (adjective) pertaining to filberts or hazelnuts | Synonyms: avellane |
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| avellane | (adjective) pertaining to filberts or hazelnuts | Synonyms: avellan |
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| avertable | (adjective) capable of being avoided or warded off | Synonyms: avertible, avoidable, evitable |
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| avertible | (adjective) capable of being avoided or warded off | Synonyms: avertable, avoidable, evitable |
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| avifaunal | (adjective) of or relating to birds of a particular region or period | Synonyms: avifaunistic |
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| avirulent | (adjective) not virulent; unable to produce disease | - |
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| avocational | (adjective) of or involved in an avocation | - |
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| avoidable | (adjective) capable of being avoided or warded off | Synonyms: avertable, avertible, evitable |
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