| abiding | (adjective) lasting a long time | Synonyms: enduring, imperishable |
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| abient | (adjective) characterized by avoidance or withdrawal | - |
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| abiogenetic | (adjective) originating by abiogenesis | - |
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| absorbing | (adjective) capable of arousing and holding the attention | Synonyms: engrossing, fascinating, gripping, riveting |
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| acerbic | (adjective) sour or bitter in taste | Synonyms: acerb, astringent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerb, acid, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| acrophobic | (adjective) suffering from acrophobia; abnormally afraid of high places | - |
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| adverbial | (adjective) of or relating to or functioning as an adverb | - |
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| aerobic | (adjective) depending on free oxygen or air | Synonyms: aerophilic, aerophilous |
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| (adjective) based on or using the principles of aerobics; enhancing respiratory and circulatory efficiency | - |
| aerobiotic | (adjective) living or active only in the presence of oxygen | - |
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| agoraphobic | (adjective) suffering from agoraphobia; abnormally afraid of open or public places | - |
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| agrobiologic | (adjective) of or pertaining to agrobiology | Synonyms: agrobiological |
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| agrobiological | (adjective) of or pertaining to agrobiology | Synonyms: agrobiologic |
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| albinal | (adjective) of or pertaining to or affected by albinism | Synonyms: albinic, albinistic, albinotic |
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| albinic | (adjective) of or pertaining to or affected by albinism | Synonyms: albinal, albinistic, albinotic |
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| albinistic | (adjective) of or pertaining to or affected by albinism | Synonyms: albinal, albinic, albinotic |
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| albino | (adjective) having albinism | - |
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| albinotic | (adjective) of or pertaining to or affected by albinism | Synonyms: albinal, albinic, albinistic |
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| albitic | (adjective) of or related to albite feldspar | - |
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| algophobic | (adjective) suffering from algophobia; abnormally afraid of pain | - |
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| ambidextrous | (adjective) equally skillful with each hand | Synonyms: two-handed |
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| (adjective) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another | Synonyms: deceitful, double-dealing, double-faced, double-tongued, duplicitous, Janus-faced, two-faced |
| ambient | (adjective) completely enveloping | - |
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| ambiguous | (adjective) having more than one possible meaning | - |
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| (adjective) open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead | Synonyms: equivocal |
| (adjective) having no intrinsic or objective meaning; not organized in conventional patterns | - |
| ambitionless | (adjective) having little desire for success or achievement | Synonyms: unambitious |
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| ambitious | (adjective) having a strong desire for success or achievement | - |
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| (adjective) requiring full use of your abilities or resources | Synonyms: challenging |
| ambivalent | (adjective) uncertain or unable to decide about what course to follow | - |
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| ambiversive | (adjective) intermediate between introversive and extroversive | - |
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| amebic | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebous, amoeban, amoebic, amoebous |
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| amoebic | (adjective) pertaining to or resembling amoebae | Synonyms: ameban, amebic, amebous, amoeban, amoebous |
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| amphibian | (adjective) relating to or characteristic of animals of the class Amphibia | Synonyms: amphibious |
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| amphibiotic | (adjective) having an aquatic early or larval form and a terrestrial adult form | Synonyms: semiaquatic |
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| amphibious | (adjective) operating or living on land and in water | - |
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| (adjective) relating to or characteristic of animals of the class Amphibia | Synonyms: amphibian |
| anabiotic | (adjective) of or related to the state of anabiosis | - |
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| anaerobic | (adjective) living or active in the absence of free oxygen | Synonyms: anaerobiotic |
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| (adjective) not aerobic | - |
| anaerobiotic | (adjective) living or active in the absence of free oxygen | Synonyms: anaerobic |
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| antecubital | (adjective) of or relating to the region of the arm in front of the elbow | - |
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| antibiotic | (adjective) of or relating to antibiotic drugs | - |
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| antimicrobial | (adjective) capable of destroying or inhibiting the growth of disease-causing microorganisms | Synonyms: antimicrobic |
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| antimicrobic | (adjective) capable of destroying or inhibiting the growth of disease-causing microorganisms | Synonyms: antimicrobial |
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| aquaphobic | (adjective) abnormally afraid of water | Synonyms: hydrophobic |
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| arbitrable | (adjective) appropriate for or subject to settlement by arbitration | - |
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| arbitral | (adjective) relating to or resulting from arbitration | Synonyms: arbitrational |
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| arbitrary | (adjective) based on or subject to individual discretion or preference or sometimes impulse or caprice | - |
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| arbitrational | (adjective) relating to or resulting from arbitration | Synonyms: arbitral |
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| arbitrative | (adjective) relating to or having the authority to arbitrate | - |
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| atrabilious | (adjective) irritable as if suffering from indigestion | Synonyms: bilious, dyspeptic, liverish |
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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 |
| biannual | (adjective) occurring or payable twice each year | Synonyms: biyearly, half-yearly, semiannual |
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| bias | (adjective) slanting diagonally across the grain of a fabric | - |
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| biased | (adjective) favoring one person or side over another | Synonyms: colored, coloured, one-sided, slanted |
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| biaural | (adjective) relating to or having or hearing with two ears | Synonyms: binaural |
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| biauricular | (adjective) relating to the two auditory openings | - |
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| biaxal | (adjective) having two axes | Synonyms: biaxate, biaxial |
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| biaxate | (adjective) having two axes | Synonyms: biaxal, biaxial |
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| biaxial | (adjective) having two axes | Synonyms: biaxal, biaxate |
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| bibbed | (adjective) having a bib | - |
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| bibless | (adjective) lacking a bib | - |
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| biblical | (adjective) of or pertaining to or contained in or in accordance with the Bible | Synonyms: scriptural |
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| (adjective) in keeping with the nature of the Bible or its times or people | - |
| bibliographic | (adjective) relating to or dealing with bibliography | Synonyms: bibliographical |
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| bibliographical | (adjective) relating to or dealing with bibliography | Synonyms: bibliographic |
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| bibliolatrous | (adjective) given to Bible-worship | - |
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| bibliomaniacal | (adjective) characteristic of or characterized by or noted for bibliomania | - |
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| bibliophilic | (adjective) of or relating to bibliophiles | - |
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| bibliopolic | (adjective) of or relating to bibliopoles | - |
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| bibliothecal | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecarial |
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| bibliothecarial | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecal |
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| bibliotic | (adjective) of or relating to bibliotics | - |
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| bibulous | (adjective) given to or marked by the consumption of alcohol | Synonyms: boozy, drunken, sottish |
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| bicameral | (adjective) composed of two legislative bodies | - |
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| (adjective) consisting of two chambers | Synonyms: two-chambered |
| bicapsular | (adjective) divided into two capsules or having a two-part capsule | - |
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| bicentenary | (adjective) of or relating to or completing a period of 200 years | Synonyms: bicentennial |
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| bicentennial | (adjective) of or relating to or completing a period of 200 years | Synonyms: bicentenary |
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| bicentric | (adjective) having two centers | - |
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| bicephalous | (adjective) having two heads | - |
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| bichromated | (adjective) treated or combined with bichromate | - |
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| bichrome | (adjective) having two colors | Synonyms: bicolor, bicolored, bicolour, bicoloured, dichromatic |
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| bicipital | (adjective) having two heads or points of origin as a biceps | - |
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| bicolor | (adjective) having two colors | Synonyms: bichrome, bicolored, bicolour, bicoloured, dichromatic |
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| bicolored | (adjective) having two colors | Synonyms: bichrome, bicolor, bicolour, bicoloured, dichromatic |
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| bicolour | (adjective) having two colors | Synonyms: bichrome, bicolor, bicolored, bicoloured, dichromatic |
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| bicoloured | (adjective) having two colors | Synonyms: bichrome, bicolor, bicolored, bicolour, dichromatic |
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| biconcave | (adjective) concave on both sides | Synonyms: concavo-concave |
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| biconvex | (adjective) convex on both sides; shaped like a lentil | Synonyms: convexo-convex, lenticular, lentiform |
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| bicorn | (adjective) having two horns or horn-shaped parts | Synonyms: bicornate, bicorned, bicornuate, bicornuous |
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| bicornate | (adjective) having two horns or horn-shaped parts | Synonyms: bicorn, bicorned, bicornuate, bicornuous |
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| bicorned | (adjective) having two horns or horn-shaped parts | Synonyms: bicorn, bicornate, bicornuate, bicornuous |
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| bicornuate | (adjective) having two horns or horn-shaped parts | Synonyms: bicorn, bicornate, bicorned, bicornuous |
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| bicornuous | (adjective) having two horns or horn-shaped parts | Synonyms: bicorn, bicornate, bicorned, bicornuate |
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| bicuspid | (adjective) having two cusps or points (especially a molar tooth) | Synonyms: bicuspidate |
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| bicuspidate | (adjective) having two cusps or points (especially a molar tooth) | Synonyms: bicuspid |
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| bicyclic | (adjective) having molecules consisting of two fused rings | - |
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| bicylindrical | (adjective) having two cylindrical surfaces usually with parallel axes | - |
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| biddable | (adjective) willing to carry out the orders or wishes of another without protest | Synonyms: acquiescent |
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| bidentate | (adjective) having toothlike projections that are themselves toothed | - |
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| bidirectional | (adjective) reactive or functioning or allowing movement in two usually opposite directions | - |
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| biennial | (adjective) having a life cycle lasting two seasons | Synonyms: two-year |
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| (adjective) occurring every second year | Synonyms: biyearly |
| biface | (adjective) having two faces or fronts | Synonyms: bifacial |
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| bifacial | (adjective) having two faces or fronts | Synonyms: biface |
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| bifid | (adjective) divided into two lobes | - |
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| bifilar | (adjective) having or using two filaments | - |
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