| abiding | (adjective) lasting a long time | Synonyms: enduring, imperishable |
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| abridged | (adjective) (used of texts) shortened by condensing or rewriting | - |
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| acanthoid | (adjective) shaped like a spine or thorn | Synonyms: acanthous, spinous |
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| accidental | (adjective) not of prime or central importance | Synonyms: incidental, nonessential |
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| (adjective) happening by chance or unexpectedly or unintentionally | Synonyms: inadvertent |
| acid | (adjective) having the characteristics of an acid | - |
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| (adjective) being sour to the taste | Synonyms: acidic, acidulent, acidulous |
| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| acidic | (adjective) being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7) | - |
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| (adjective) being sour to the taste | Synonyms: acid, acidulent, acidulous |
| acidimetric | (adjective) involving or related to acidimetry | - |
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| acidophilic | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilous, aciduric |
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| acidophilous | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilic, aciduric |
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| acidotic | (adjective) having or being characterized by acidosis | - |
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| acidulent | (adjective) being sour to the taste | Synonyms: acid, acidic, acidulous |
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| acidulous | (adjective) being sour to the taste | Synonyms: acid, acidic, acidulent |
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| aciduric | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilic, acidophilous |
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| acrid | (adjective) strong and sharp | Synonyms: pungent |
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| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, bitter, blistering, caustic, sulfurous, sulphurous, virulent, vitriolic |
| actinoid | (adjective) having a radial form | - |
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| adenoid | (adjective) relating to or resembling lymphatic glands or lymphoid tissue | - |
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| adenoidal | (adjective) of or pertaining to the adenoids | - |
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| (adjective) sounding as if the nose were pinched | Synonyms: nasal, pinched |
| aforesaid | (adjective) being the one previously mentioned or spoken of | Synonyms: aforementioned, said |
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| afraid | (adjective) filled with fear or apprehension | - |
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| (adjective) filled with regret or concern; used often to soften an unpleasant statement | - |
| (adjective) having feelings of aversion or unwillingness | - |
| (adjective) feeling worry or concern or insecurity | - |
| aided | (adjective) having help; often used as a combining form | Synonyms: assisted |
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| algid | (adjective) chilly | - |
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| algoid | (adjective) of or resembling algae | - |
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| alkaloidal | (adjective) pertaining to or consisting of alkaloids | - |
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| allantoid | (adjective) shaped like a sausage | Synonyms: sausage-shaped |
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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 |
| ameboid | (adjective) like an amoeba (especially in having a variable irregular shape) | Synonyms: amoeboid |
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| amidship | (adjective) located in the middle part of a ship or aircraft | - |
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| amoeboid | (adjective) like an amoeba (especially in having a variable irregular shape) | Synonyms: ameboid |
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| amygdaloid | (adjective) shaped like an almond | Synonyms: almond-shaped, amygdaliform, amygdaloidal |
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| amygdaloidal | (adjective) shaped like an almond | Synonyms: almond-shaped, amygdaliform, amygdaloid |
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| amyloid | (adjective) resembling starch | Synonyms: amylaceous, amyloidal, farinaceous, starchlike |
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| amyloidal | (adjective) resembling starch | Synonyms: amylaceous, amyloid, farinaceous, starchlike |
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| aneroid | (adjective) containing no liquid or actuated without the use of liquid | - |
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| aneuploid | (adjective) having a chromosome number that is not an exact multiple of the haploid number | - |
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| annelid | (adjective) relating to or belonging to or characteristic of any worms of the phylum Annelida | Synonyms: annelidan |
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| annelidan | (adjective) relating to or belonging to or characteristic of any worms of the phylum Annelida | Synonyms: annelid |
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| antacid | (adjective) acting to neutralize acid (especially in the stomach) | - |
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| antemeridian | (adjective) before noon | - |
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| antheridial | (adjective) relating to or characterized by an antheridium | - |
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| anthropoid | (adjective) resembling human beings | Synonyms: manlike |
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| (adjective) resembling apes | Synonyms: anthropoidal, apelike |
| anthropoidal | (adjective) resembling apes | Synonyms: anthropoid, apelike |
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| antiapartheid | (adjective) opposing the policy of apartheid in South Africa | - |
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| antidotal | (adjective) counteracting the effects of a poison | - |
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| antidromic | (adjective) conducting nerve impulses in a direction opposite to normal | - |
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| antithyroid | (adjective) having the effect of counteracting excessive thyroid activity | - |
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| apoplectoid | (adjective) resembling apoplexy | Synonyms: apoplectiform |
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| apsidal | (adjective) of or relating to an apse | - |
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| arachnidian | (adjective) relating to or resembling a member of the class Arachnida | Synonyms: arachnoid, spiderlike, spiderly, spidery |
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| arachnoid | (adjective) relating to or resembling a member of the class Arachnida | Synonyms: arachnidian, spiderlike, spiderly, spidery |
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| araneidal | (adjective) relating to or resembling a spider | Synonyms: araneidan |
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| araneidan | (adjective) relating to or resembling a spider | Synonyms: araneidal |
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| archidiaconal | (adjective) of or relating to an archdeacon or his office | - |
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| arid | (adjective) lacking sufficient water or rainfall | Synonyms: waterless |
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| (adjective) lacking vitality or spirit; lifeless | Synonyms: desiccate, desiccated |
| aroid | (adjective) relating to a plant of the family Araceae | Synonyms: araceous |
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| assiduous | (adjective) marked by care and persistent effort | Synonyms: sedulous |
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| asteroid | (adjective) shaped like a star | Synonyms: star-shaped |
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| asteroidal | (adjective) of or relating to or resembling an asteroid | - |
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| autacoidal | (adjective) of or relating to an autacoid | - |
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| autodidactic | (adjective) relating to or having the characteristics of an autodidact | - |
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| avid | (adjective) (often followed by `for') ardently or excessively desirous | Synonyms: devouring, esurient, greedy |
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| (adjective) marked by active interest and enthusiasm | Synonyms: zealous |
| avoidable | (adjective) capable of being avoided or warded off | Synonyms: avertable, avertible, evitable |
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| azido | (adjective) relating to or containing the azido group N3 | - |
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| bactericidal | (adjective) preventing infection by inhibiting the growth or action of microorganisms | Synonyms: disinfectant, germicidal |
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| bacterioid | (adjective) resembling bacteria | Synonyms: bacterioidal, bacteroid, bacteroidal |
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| bacterioidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacteroid, bacteroidal |
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| bacteroid | (adjective) resembling bacteria | Synonyms: bacterioid, bacterioidal, bacteroidal |
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| bacteroidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacterioidal, bacteroid |
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| basidial | (adjective) relating to or characterized by basidia | - |
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| basidiomycetous | (adjective) pertaining to or characteristic of fungi of the class Basidiomycetes | - |
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| basidiosporous | (adjective) of or relating to or characterized by spores produced by basidia | - |
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| bedrid | (adjective) confined to bed (by illness) | Synonyms: bedfast, bedridden, sick-abed |
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| bedridden | (adjective) confined to bed (by illness) | Synonyms: bedfast, bedrid, sick-abed |
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| benzenoid | (adjective) similar to benzene in structure or linkage | - |
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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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| 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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| bifid | (adjective) divided into two lobes | - |
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| bipinnatifid | (adjective) pinnatifid with the segments also pinnatifid | - |
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| bitumenoid | (adjective) like bitumen | Synonyms: bituminoid |
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| bituminoid | (adjective) like bitumen | Synonyms: bitumenoid |
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| boskopoid | (adjective) belonging or relating to or resembling Boskop man | - |
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| botryoid | (adjective) resembling a cluster of grapes in form | Synonyms: botryoidal, boytrose |
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| botryoidal | (adjective) resembling a cluster of grapes in form | Synonyms: botryoid, boytrose |
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| bovid | (adjective) of or relating to or belonging to the genus Bos (cattle) | Synonyms: bovine |
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| braided | (adjective) woven by (or as if by) braiding | - |
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| bridal | (adjective) of or pertaining to a bride | - |
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| (adjective) of or relating to a wedding | Synonyms: nuptial, spousal |
| bridgeable | (adjective) capable of being connected by a bridge or as if by a bridge | - |
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| broadside | (adjective) toward a full side | - |
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| bromidic | (adjective) given to uttering bromides | - |
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| (adjective) dull and tiresome but with pretensions of significance or originality | Synonyms: corny, platitudinal, platitudinous |
| bungaloid | (adjective) characterized by bungalows | - |
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| cancroid | (adjective) of or relating to a cancroid | - |
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| candid | (adjective) characterized by directness in manner or speech; without subtlety or evasion | Synonyms: blunt, forthright, frank, free-spoken, outspoken, plainspoken, point-blank, straight-from-the-shoulder |
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| (adjective) openly straightforward and direct without reserve or secretiveness | Synonyms: heart-to-heart, open |
| (adjective) informal or natural; especially caught off guard or unprepared | - |
| carangid | (adjective) of or relating to fish of the family Carangidae | - |
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| carotid | (adjective) of or relating to either of the two major arteries supplying blood to the head and neck | - |
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| celluloid | (adjective) artificial as if portrayed in a film | Synonyms: synthetic |
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| cellulosid | (adjective) of or containing or made from cellulose | - |
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| centroidal | (adjective) of or relating to (especially passing through) a centroid | - |
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| chancroidal | (adjective) of or relating to or having chancroids | - |
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