| abactinal | (adjective) (of radiate animals) located on the surface or end opposite to that on which the mouth is situated | - |
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| abatable | (adjective) capable of being abated | - |
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| abaxial | (adjective) facing away from the axis of an organ or organism | Synonyms: dorsal |
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| abbatial | (adjective) of or having to do with or belonging to an abbey or abbot, or abbess | - |
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| abdicable | (adjective) capable of being discarded or renounced or relinquished | - |
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| abdominal | (adjective) of or relating to or near the abdomen | - |
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| abdominovesical | (adjective) of or relating to the abdomen and the urinary bladder | - |
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| ablated | (adjective) made smaller or less by melting or erosion or vaporization | - |
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| ablative | (adjective) relating to the ablative case | - |
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| (adjective) tending to ablate; i.e. to be removed or vaporized at very high temperature | - |
| ablaze | (adjective) resembling flame in brilliance or color | - |
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| (adjective) lighted with red light as if with flames | Synonyms: inflamed, reddened |
| (adjective) lighted up by or as by fire or flame | Synonyms: afire, aflame, aflare, alight, on fire |
| (adjective) keenly excited (especially sexually) or indicating excitement | Synonyms: aflame, aroused |
| able | (adjective) (usually followed by `to') having the necessary means or skill or know-how or authority to do something | - |
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| (adjective) having inherent physical or mental ability or capacity | - |
| (adjective) have the skills and qualifications to do things well | Synonyms: capable |
| (adjective) having a strong healthy body | Synonyms: able-bodied |
| abloom | (adjective) when the bud, or buds, on a plant are bursting into flower | Synonyms: efflorescent |
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| ablutionary | (adjective) cleansing the body by washing; especially ritual washing of e.g. hands | Synonyms: cleansing |
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| abnormal | (adjective) not normal; not typical or usual or regular or conforming to a norm | Synonyms: unnatural |
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| (adjective) departing from the normal in e.g. intelligence and development | - |
| (adjective) much greater than the normal | - |
| abolishable | (adjective) capable of being abolished | - |
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| abolitionary | (adjective) relating to or favoring abolition, especially abolition of slavery | - |
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| abomasal | (adjective) relating to the abomasum (the fourth compartment of the stomach of ruminants) | - |
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| abominable | (adjective) exceptionally bad or displeasing | Synonyms: atrocious, awful, dreadful, painful, terrible, unspeakable |
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| (adjective) unequivocally detestable | Synonyms: detestable, execrable, odious |
| aboral | (adjective) opposite to or away from the mouth | - |
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| aboriginal | (adjective) characteristic of or relating to people inhabiting a region from the beginning | Synonyms: native |
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| (adjective) having existed from the beginning; in an earliest or original stage or state | Synonyms: primaeval, primal, primeval, primordial |
| aboulic | (adjective) suffering from abulia; showing abnormal inability to act or make decisions | Synonyms: abulic |
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| abranchial | (adjective) having no gills | Synonyms: abranchiate, abranchious, gill-less |
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| absolute | (adjective) perfect or complete or pure | - |
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| (adjective) not limited by law | - |
| (adjective) not capable of being violated or infringed | Synonyms: infrangible, inviolable |
| (adjective) expressing finality with no implication of possible change | - |
| (adjective) complete and without restriction or qualification; sometimes used informally as intensifiers | Synonyms: downright, out-and-out, rank, right-down, sheer |
| absolutist | (adjective) pertaining to the principle of totalitarianism | Synonyms: absolutistic |
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| absolutistic | (adjective) pertaining to the principle of totalitarianism | Synonyms: absolutist |
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| absolved | (adjective) freed from any question of guilt | Synonyms: clear, cleared, exculpated, exonerated, vindicated |
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| absolvitory | (adjective) providing absolution | Synonyms: exonerative, forgiving |
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| absorbable | (adjective) capable of being absorbed or taken in through the pores of a surface | - |
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| abulic | (adjective) suffering from abulia; showing abnormal inability to act or make decisions | Synonyms: aboulic |
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| abysmal | (adjective) resembling an abyss in depth; so deep as to be unmeasurable | Synonyms: abyssal, unfathomable |
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| (adjective) very great; limitless | - |
| abyssal | (adjective) relating to ocean depths from 2000 to 5000 meters | - |
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| (adjective) resembling an abyss in depth; so deep as to be unmeasurable | Synonyms: abysmal, unfathomable |
| acapnial | (adjective) relating to or demonstrating acapnia | Synonyms: acapnic, acapnotic |
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| acarpellous | (adjective) having no carpels | Synonyms: acarpelous |
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| acarpelous | (adjective) having no carpels | Synonyms: acarpellous |
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| acatalectic | (adjective) (verse) metrically complete; especially having the full number of syllables in the final metrical foot | - |
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| acaudal | (adjective) lacking a tail or taillike appendage | Synonyms: acaudate |
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| acaulescent | (adjective) (of plants) having no apparent stem above ground | Synonyms: stemless |
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| accelerando | (adjective) (music) gradually increasing in tempo | - |
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| accelerated | (adjective) speeded up, as of an academic course | - |
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| accelerative | (adjective) tending to increase velocity | Synonyms: acceleratory |
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| acceleratory | (adjective) tending to increase velocity | Synonyms: accelerative |
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| accentual | (adjective) (of verse) having a metric system based on stress rather than syllables or quantity | - |
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| (adjective) of or pertaining to accent or stress | - |
| acceptable | (adjective) worthy of acceptance or satisfactory | - |
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| (adjective) adequate for the purpose | - |
| (adjective) meeting requirements | Synonyms: decent, satisfactory |
| (adjective) judged to be in conformity with approved usage | - |
| accessible | (adjective) capable of being reached | - |
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| (adjective) easy to get along with or talk to; friendly | - |
| (adjective) easily obtained | - |
| (adjective) capable of being read with comprehension | Synonyms: approachable |
| accessional | (adjective) of or constituting an accession | - |
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| accessorial | (adjective) nonessential but helpful | - |
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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 |
| acclivitous | (adjective) sloping upward | Synonyms: rising, uphill |
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| accommodational | (adjective) of or relating to the accommodation of the lens of the eye | - |
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| accomplishable | (adjective) capable of existing or taking place or proving true; possible to do | Synonyms: achievable, doable, manageable, realizable |
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| accomplished | (adjective) successfully completed or brought to an end | Synonyms: completed, realised, realized |
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| (adjective) settled securely and unconditionally | Synonyms: effected, established |
| (adjective) highly skilled | Synonyms: complete |
| accountable | (adjective) liable to account for one's actions | Synonyms: answerable |
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| acculturational | (adjective) of or relating to acculturation | Synonyms: acculturative |
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| acculturative | (adjective) of or relating to acculturation | Synonyms: acculturational |
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| accumulated | (adjective) periodically accumulated over time | Synonyms: accrued |
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| accumulative | (adjective) marked by acquiring or amassing | - |
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| (adjective) increasing by successive addition | Synonyms: cumulative |
| accusatorial | (adjective) specifically indicating a form of prosecution in which one is publicly accused of and tried for a crime and in which the judge is not also the prosecutor | - |
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| acellular | (adjective) not made up of or divided into cells | Synonyms: noncellular |
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| acephalous | (adjective) lacking a head or a clearly defined head | - |
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| acetabular | (adjective) of the cup-shaped socket that receives the head of the thigh bone | Synonyms: cotyloid, cotyloidal |
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| acetylenic | (adjective) of or related to acetylene | - |
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| acetylic | (adjective) of or related to acetic acid | - |
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| achenial | (adjective) pertaining to dry one-seeded indehiscent fruit | - |
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| achievable | (adjective) capable of existing or taking place or proving true; possible to do | Synonyms: accomplishable, doable, manageable, realizable |
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| achlamydeous | (adjective) not having a floral envelope or perianth | - |
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| achlorhydric | (adjective) lacking hydrochloric acid | - |
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| achondroplastic | (adjective) of or relating to achondroplasia | - |
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| acicular | (adjective) narrow and long and pointed; as pine leaves | Synonyms: acerate, acerose, needle-shaped |
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| aciculate | (adjective) related to plants or animals or crystals having aciculae or needlelike parts | - |
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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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| 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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| acknowledgeable | (adjective) capable of being acknowledged | - |
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| acknowledged | (adjective) recognized or made known or admitted | - |
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| (adjective) generally accepted | - |
| acold | (adjective) of persons; feeling cold | - |
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| acoustical | (adjective) of or relating to the science of acoustics | Synonyms: acoustic |
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| acquirable | (adjective) capable of being acquired | - |
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| acritical | (adjective) without a crisis (as of some diseases) | - |
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| acromegalic | (adjective) marked or affected by enlargement or hypertrophy of the extremities or the face | - |
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| acropetal | (adjective) of leaves or flowers; developing or opening in succession from base to apex | - |
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| actable | (adjective) capable of being acted; suitable for the stage | - |
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| actinal | (adjective) (of radiate organisms) located on the surface or end on which the mouth is situated | - |
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| actinometrical | (adjective) of or related to actinometry | Synonyms: actinometric |
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| actinomycetal | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetous |
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| actionable | (adjective) affording grounds for legal action | - |
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| actual | (adjective) presently existing in fact and not merely potential or possible | Synonyms: existent |
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| (adjective) being or existing at the present moment | - |
| (adjective) taking place in reality; not pretended or imitated | - |
| (adjective) being or reflecting the essential or genuine character of something | Synonyms: genuine, literal, real |
| (adjective) existing in act or fact | Synonyms: factual |
| actuarial | (adjective) of or relating to the work of an actuary | - |
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| aculeate | (adjective) having or resembling a stinger or barb | Synonyms: aculeated |
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| aculeated | (adjective) having or resembling a stinger or barb | Synonyms: aculeate |
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| acyclic | (adjective) not cyclic; especially having parts arranged in spirals rather than whorls | - |
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| (adjective) having an open chain structure | Synonyms: open-chain |
| adactylous | (adjective) without fingers and/or toes | - |
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| adaptable | (adjective) capable of adapting (of becoming or being made suitable) to a particular situation or use | - |
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| adaptational | (adjective) of or relating to adaptation | - |
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| adaxial | (adjective) nearest to or facing toward the axis of an organ or organism | Synonyms: ventral |
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| addable | (adjective) capable of being added or added to | Synonyms: addible |
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| addible | (adjective) capable of being added or added to | Synonyms: addable |
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| additional | (adjective) further or added | Synonyms: extra |
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| addlebrained | (adjective) stupid and confused | Synonyms: addlepated, muddleheaded, puddingheaded |
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| addled | (adjective) confused and vague; used especially of thinking | Synonyms: befuddled, muddled, muzzy, woolly-headed, woolly, wooly-minded, wooly |
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| (adjective) (of eggs) no longer edible | - |