| abecedarian | (adjective) alphabetically arranged (as for beginning readers) | - |
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| aeonian | (adjective) of or relating to a geological eon (longer than an era) | Synonyms: eonian |
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| (adjective) continuing forever or indefinitely | Synonyms: ageless, eonian, eternal, everlasting, perpetual, unceasing, unending |
| aesculapian | (adjective) of or belonging to Aesculapius or the healing art | Synonyms: medical |
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| agrarian | (adjective) relating to farming or agriculture | Synonyms: agricultural, farming |
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| ambrosian | (adjective) worthy of the gods | Synonyms: ambrosial |
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| (adjective) extremely pleasing to the taste; sweet and fragrant | Synonyms: ambrosial, nectarous |
| amphibian | (adjective) relating to or characteristic of animals of the class Amphibia | Synonyms: amphibious |
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| antediluvian | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvial |
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| (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antiquated, archaic |
| antemeridian | (adjective) before noon | - |
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| antiauthoritarian | (adjective) opposed to authoritarianism | - |
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| antinomian | (adjective) relating to or influenced by antinomianism | - |
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| antiquarian | (adjective) of or relating to antiques or antiquities | - |
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| (adjective) of or relating to persons who study or deal in antiques or antiquities | - |
| apian | (adjective) relating to or having the characteristics of bees | - |
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| apiarian | (adjective) relating to bees or beekeeping | - |
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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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| arcadian | (adjective) (used with regard to idealized country life) idyllically rustic | Synonyms: bucolic, pastoral |
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| archosaurian | (adjective) of or relating to reptiles of the subclass Archosauria | - |
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| artesian | (adjective) (of water) rising to the surface under internal hydrostatic pressure | - |
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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 |
| avian | (adjective) pertaining to or characteristic of birds | - |
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| bacchanalian | (adjective) used of riotously drunken merrymaking | Synonyms: bacchanal, bacchic, carousing, orgiastic |
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| barbarian | (adjective) without civilizing influences | Synonyms: barbaric, savage, uncivilised, uncivilized, wild |
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| batrachian | (adjective) relating to frogs and toads | Synonyms: anuran, salientian |
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| bohemian | (adjective) unconventional in especially appearance and behavior | - |
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| caecilian | (adjective) of or relating to or belonging to the family Caeciliidae | - |
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| caesarian | (adjective) relating to abdominal delivery | Synonyms: caesarean, cesarean, cesarian |
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| callipygian | (adjective) pertaining to or having finely developed buttocks | Synonyms: callipygous |
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| callithumpian | (adjective) of or relating to a callithump | - |
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| catapultian | (adjective) of or like a catapult | Synonyms: catapultic |
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| catarrhinian | (adjective) of or related to Old World monkeys that have nostrils together and opening downward | Synonyms: catarrhine |
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| centenarian | (adjective) being at least 100 years old | - |
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| cesarian | (adjective) relating to abdominal delivery | Synonyms: caesarean, caesarian, cesarean |
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| chelonian | (adjective) of or relating to or resembling or being a turtle or tortoise | - |
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| christian | (adjective) following the teachings or manifesting the qualities or spirit of Jesus Christ | - |
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| chthonian | (adjective) dwelling beneath the surface of the earth | Synonyms: chthonic, nether |
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| circadian | (adjective) of or relating to biological processes occurring at 24-hour intervals | - |
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| civilian | (adjective) associated with civil life or performed by persons who are not active members of the military | - |
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| corinthian | (adjective) of or relating to or characteristic of Corinth or its inhabitants | - |
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| (adjective) of or pertaining to the Corinthian style of architecture | - |
| cyprian | (adjective) resembling the ancient orgiastic worship of Aphrodite on Cyprus | - |
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| diluvian | (adjective) of or connected with a deluge | Synonyms: diluvial |
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| dioecian | (adjective) having male and female reproductive organs in separate plants or animals | Synonyms: dioecious |
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| dystopian | (adjective) as bad as can be; characterized by human misery | - |
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| (adjective) of or pertaining to or resembling a dystopia | - |
| egalitarian | (adjective) favoring social equality | Synonyms: classless |
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| elysian | (adjective) relating to the Elysian Fields | - |
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| (adjective) being of such surpassing excellence as to suggest inspiration by the gods | Synonyms: divine, inspired |
| eonian | (adjective) of or relating to a geological eon (longer than an era) | Synonyms: aeonian |
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| (adjective) continuing forever or indefinitely | Synonyms: aeonian, ageless, eternal, everlasting, perpetual, unceasing, unending |
| equestrian | (adjective) of or relating to or featuring horseback riding | - |
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| (adjective) of or relating to or composed of knights | - |
| euclidian | (adjective) relating to geometry as developed by Euclid | Synonyms: euclidean |
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| eutherian | (adjective) of or relating to or belonging to the subclass Eutheria | - |
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| fabian | (adjective) using cautious slow strategy to wear down opposition; avoiding direct confrontation | - |
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| hominian | (adjective) characterizing the family Hominidae, which includes Homo sapiens as well as extinct species of manlike creatures | Synonyms: hominid |
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| humanitarian | (adjective) of or relating to or characteristic of humanitarianism | - |
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| (adjective) marked by humanistic values and devotion to human welfare | Synonyms: human-centered, human-centred, humanist, humanistic |
| isthmian | (adjective) of or relating to or forming an isthmus | - |
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| labyrinthian | (adjective) resembling a labyrinth in form or complexity | Synonyms: labyrinthine, mazy |
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| lacertilian | (adjective) of or relating to lizards | Synonyms: saurian |
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| lapidarian | (adjective) inscribed on stone | - |
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| latitudinarian | (adjective) unwilling to accept authority or dogma (especially in religion) | Synonyms: free-thinking, undogmatic, undogmatical |
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| leptorrhinian | (adjective) having a long narrow nose | Synonyms: leptorhine, leptorrhine, leptorrhinic |
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| lesbian | (adjective) of or relating to or characterized by homosexual relations between woman | Synonyms: sapphic |
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| lilliputian | (adjective) very small | Synonyms: bantam, diminutive, flyspeck, midget, petite, tiny |
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| (adjective) (informal) small and of little importance | Synonyms: fiddling, footling, little, niggling, petty, picayune, piddling, piffling, trivial |
| mammalian | (adjective) of or relating to the class Mammalia | - |
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| median | (adjective) relating to or situated in or extending toward the middle | Synonyms: medial |
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| (adjective) dividing an animal into right and left halves | Synonyms: medial |
| (adjective) relating to or constituting the middle value of an ordered set of values (or the average of the middle two in a set with an even number of values) | Synonyms: average |
| mephistophelian | (adjective) showing the cunning or ingenuity or wickedness typical of a devil | Synonyms: devilish, diabolic, diabolical, mephistophelean |
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| meridian | (adjective) of or happening at noon | - |
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| (adjective) being at the best stage of development | Synonyms: prime |
| millenarian | (adjective) relating to or believing in the millennium of peace and happiness | Synonyms: chiliastic |
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| millennian | (adjective) relating to a millennium or span of a thousand years | Synonyms: millennial |
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| nonagenarian | (adjective) being from 90 to 99 years old | - |
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| nonchristian | (adjective) not believing in Christ | Synonyms: christless |
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| nonsectarian | (adjective) not restricted to one sect or school or party | Synonyms: unsectarian |
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| octogenarian | (adjective) being from 80 to 89 years old | - |
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| olympian | (adjective) far beyond what is usual in magnitude or degree | Synonyms: exceeding, exceptional, prodigious, surpassing |
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| (adjective) majestic in manner or bearing; superior to mundane matters | Synonyms: majestic |
| ovarian | (adjective) of or involving the ovaries | - |
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| patrician | (adjective) belonging to or characteristic of the nobility or aristocracy | Synonyms: aristocratic, aristocratical, blue-blooded, blue, gentle |
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| (adjective) befitting a person of noble origin | - |
| pedestrian | (adjective) lacking wit or imagination | Synonyms: earthbound, prosaic, prosy |
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| platyrhinian | (adjective) of or related to New World monkeys having nostrils far apart or to people with broad noses | Synonyms: broadnosed, platyrhine, platyrrhine, platyrrhinian, platyrrhinic |
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| platyrrhinian | (adjective) of or related to New World monkeys having nostrils far apart or to people with broad noses | Synonyms: broadnosed, platyrhine, platyrhinian, platyrrhine, platyrrhinic |
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| plebeian | (adjective) of or associated with the great masses of people | Synonyms: common, unwashed, vulgar |
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| postdiluvian | (adjective) existing or occurring after Noah's flood | - |
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| postmeridian | (adjective) after midday | - |
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| praetorian | (adjective) of or relating to a Roman praetor | Synonyms: praetorial, pretorial, pretorian |
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| predestinarian | (adjective) of or relating to predestination; holding the doctrine of predestination | - |
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| prelapsarian | (adjective) of or relating to the time before the Fall of Adam and Eve | - |
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| pretorian | (adjective) of or relating to a Roman praetor | Synonyms: praetorial, praetorian, pretorial |
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| proletarian | (adjective) belonging to or characteristic of the proletariat | - |
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| quotidian | (adjective) found in the ordinary course of events | Synonyms: everyday, mundane, routine, unremarkable, workaday |
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| reptilian | (adjective) of or relating to the class Reptilia | - |
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| riparian | (adjective) of or relating to or located on the banks of a river or stream | - |
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| salientian | (adjective) relating to frogs and toads | Synonyms: anuran, batrachian |
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| saurian | (adjective) of or relating to lizards | Synonyms: lacertilian |
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| sectarian | (adjective) of or relating to or characteristic of a sect or sects | - |
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| sesquipedalian | (adjective) (of words) long and ponderous; having many syllables | Synonyms: polysyllabic |
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| (adjective) given to the overuse of long words | - |
| sexagenarian | (adjective) being from 60 to 69 years old | - |
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| simian | (adjective) relating to or resembling an ape | - |
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| stentorian | (adjective) (used of the voice or sound) deep and resonant | Synonyms: booming |
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| subartesian | (adjective) (of water) rising naturally in a well to a height appreciably above that of the surrounding water table but not flowing out of the well | - |
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| subclavian | (adjective) situated beneath the clavicle | - |
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| tellurian | (adjective) of or relating to or inhabiting the land as opposed to the sea or air | Synonyms: telluric, terrene, terrestrial |
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| tertian | (adjective) relating to symptoms (especially malarial fever) that appear every other day | - |
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| (adjective) of or relating to a tonal system based on major thirds | - |
| thespian | (adjective) of or relating to drama | - |
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| totalitarian | (adjective) of or relating to the principles of totalitarianism according to which the state regulates every realm of life | Synonyms: totalistic |
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| (adjective) characterized by a government in which the political authority exercises absolute and centralized control | - |
| unchristian | (adjective) not of a Christian faith | - |
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| unsectarian | (adjective) not restricted to one sect or school or party | Synonyms: nonsectarian |
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