| epistemological | (adjective) of or relating to epistemology | Synonyms: epistemic |
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| epithelial | (adjective) of or belonging to the epithelium | Synonyms: epithelioid |
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| epochal | (adjective) highly significant or important especially bringing about or marking the beginning of a new development or era | Synonyms: epoch-making |
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| equal | (adjective) having the same quantity, value, or measure as another | - |
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| (adjective) having the requisite qualities or resources to meet a task | Synonyms: adequate |
| equatorial | (adjective) of or existing at or near the geographic equator | - |
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| (adjective) of or relating to conditions at the geographical equator | - |
| (adjective) of or relating to or at an equator | - |
| equilateral | (adjective) having all sides or faces equal | - |
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| equinoctial | (adjective) relating to an equinox (when the lengths of night and day are equal) | - |
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| (adjective) relating to the vicinity of the equator | - |
| equivocal | (adjective) open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead | Synonyms: ambiguous |
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| (adjective) uncertain as a sign or indication | - |
| (adjective) open to question | - |
| eremitical | (adjective) of or relating to or befitting eremites or their practices of hermitic living | Synonyms: eremitic |
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| (adjective) characterized by ascetic solitude | Synonyms: anchoritic, eremitic, hermitic, hermitical |
| eristical | (adjective) given to disputation for its own sake and often employing specious arguments | Synonyms: eristic |
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| eschatological | (adjective) of or relating to or dealing with or regarding the ultimate destiny of mankind and the world | - |
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| esophageal | (adjective) relating to the esophagus | - |
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| especial | (adjective) surpassing what is common or usual or expected | Synonyms: exceptional, particular, special |
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| essential | (adjective) basic and fundamental | - |
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| (adjective) defining rights and duties as opposed to giving the rules by which rights and duties are established | Synonyms: substantive |
| (adjective) being or relating to or containing the essence of a plant etc | - |
| (adjective) of the greatest importance | Synonyms: all-important, all important, crucial, of the essence |
| (adjective) absolutely necessary; vitally necessary | Synonyms: indispensable |
| esthetical | (adjective) concerning or characterized by an appreciation of beauty or good taste | Synonyms: aesthetic, aesthetical, esthetic |
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| estival | (adjective) (rare) of or occurring in summer | Synonyms: aestival |
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| estuarial | (adjective) of or relating to or found in estuaries | Synonyms: estuarine |
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| eternal | (adjective) tiresomely long; seemingly without end | Synonyms: endless, interminable |
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| (adjective) continuing forever or indefinitely | Synonyms: aeonian, ageless, eonian, everlasting, perpetual, unceasing, unending |
| ethereal | (adjective) of or containing or dissolved in ether | - |
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| (adjective) characterized by unusual lightness and delicacy | Synonyms: gossamer |
| (adjective) of heaven or the spirit | Synonyms: celestial, supernal |
| (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aerial, aeriform, aery, airy |
| ethical | (adjective) conforming to accepted standards of social or professional behavior | - |
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| (adjective) of or relating to the philosophical study of ethics | - |
| (adjective) adhering to ethical and moral principles | Synonyms: honorable, honourable |
| ethnical | (adjective) denoting or deriving from or distinctive of the ways of living built up by a group of people | Synonyms: cultural, ethnic |
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| ethnographical | (adjective) of or relating to ethnography | Synonyms: ethnographic |
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| ethnological | (adjective) of or relating to ethnology | Synonyms: ethnologic |
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| etiological | (adjective) relating to the etiology of a disease | Synonyms: aetiologic, aetiological, etiologic |
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| (adjective) of or relating to the philosophical study of causation | Synonyms: aetiologic, aetiological, etiologic |
| etymological | (adjective) based on or belonging to etymology | - |
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| euphonical | (adjective) of or relating to or characterized by euphony | Synonyms: euphonic |
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| evangelical | (adjective) of or pertaining to or in keeping with the Christian gospel especially as in the first 4 books of the New Testament | - |
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| (adjective) relating to or being a Christian church believing in personal conversion and the inerrancy of the Bible especially the 4 Gospels | - |
| (adjective) marked by ardent or zealous enthusiasm for a cause | Synonyms: evangelistic |
| eventful | (adjective) full of events or incidents | - |
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| (adjective) having important issues or results | Synonyms: consequential |
| eventual | (adjective) expected to follow in the indefinite future from causes already operating | - |
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| evidential | (adjective) serving as or based on evidence | Synonyms: evidentiary |
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| evil | (adjective) morally bad or wrong | - |
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| (adjective) having or exerting a malignant influence | Synonyms: malefic, malevolent, malign |
| (adjective) having the nature of vice | Synonyms: vicious |
| exaugural | (adjective) occurring at or marking the close of a term of office | - |
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| exceptional | (adjective) deviating widely from a norm of physical or mental ability; used especially of children below normal in intelligence | - |
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| (adjective) far beyond what is usual in magnitude or degree | Synonyms: exceeding, olympian, prodigious, surpassing |
| (adjective) surpassing what is common or usual or expected | Synonyms: especial, particular, special |
| exegetical | (adjective) relating to exegesis | Synonyms: exegetic |
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| existential | (adjective) relating to or dealing with existence (especially with human existence) | - |
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| (adjective) of or as conceived by existentialism | - |
| (adjective) derived from experience or the experience of existence | Synonyms: experiential |
| exothermal | (adjective) (of a chemical reaction or compound) occurring or formed with the liberation of heat | Synonyms: exothermic, heat-releasing |
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| experiential | (adjective) relating to or resulting from experience | - |
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| (adjective) derived from experience or the experience of existence | Synonyms: existential |
| experimental | (adjective) relating to or based on experiment | - |
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| (adjective) relying on observation or experiment | Synonyms: data-based, observational |
| (adjective) of the nature of or undergoing an experiment | - |
| exponential | (adjective) of or involving exponents | - |
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| extensional | (adjective) defining a word by listing the class of entities to which the word correctly applies | - |
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| external | (adjective) happening or arising or located outside or beyond some limits or especially surface | - |
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| (adjective) coming from the outside | Synonyms: extraneous, outside |
| (adjective) from or between other countries | Synonyms: international, outside |
| (adjective) purely outward or superficial | - |
| exterritorial | (adjective) outside territorial limits or jurisdiction | Synonyms: extraterritorial |
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| extradural | (adjective) on or outside the dura mater | Synonyms: epidural |
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| extrajudicial | (adjective) beyond the usual course of legal proceedings; legally unwarranted | - |
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| extralegal | (adjective) not regulated or sanctioned by law | Synonyms: nonlegal |
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| extramarital | (adjective) characterized by adultery | Synonyms: adulterous, extracurricular |
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| extramural | (adjective) carried on outside the bounds of an institution or community | - |
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| extraterrestrial | (adjective) originating or located or occurring outside Earth or its atmosphere | - |
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| extraterritorial | (adjective) outside territorial limits or jurisdiction | Synonyms: exterritorial |
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| exuvial | (adjective) of or relating to the cast-off skins or cuticles of various animals | - |
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| facial | (adjective) of or concerning the face | - |
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| (adjective) of or pertaining to the outside surface of an object | - |
| factorial | (adjective) of or relating to factorials | - |
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| factual | (adjective) of or relating to or characterized by facts | - |
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| (adjective) existing in act or fact | Synonyms: actual |
| faecal | (adjective) of or relating to feces | Synonyms: fecal |
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| faithful | (adjective) steadfast in affection or allegiance | - |
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| (adjective) not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend | - |
| (adjective) marked by fidelity to an original | Synonyms: close |
| familial | (adjective) relating to or having the characteristics of a family | - |
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| (adjective) occurring among members of a family usually by heredity | Synonyms: genetic, hereditary, inherited, transmissible, transmitted |
| fanatical | (adjective) marked by excessive enthusiasm for and intense devotion to a cause or idea | Synonyms: fanatic, overzealous, rabid |
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| fanciful | (adjective) indulging in or influenced by fancy | Synonyms: notional |
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| (adjective) having a curiously intricate quality | - |
| (adjective) not based on fact; existing only in the imagination | Synonyms: imaginary, notional |
| fantastical | (adjective) ludicrously odd | Synonyms: antic, fantastic, grotesque |
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| (adjective) existing in fancy only | Synonyms: fantastic |
| farcical | (adjective) broadly or extravagantly humorous; resembling farce | Synonyms: ludicrous, ridiculous |
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| fatal | (adjective) bringing death | - |
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| (adjective) having momentous consequences; of decisive importance | Synonyms: fateful |
| (adjective) controlled or decreed by fate; predetermined | Synonyms: fateful |
| (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: black, calamitous, disastrous, fateful |
| fateful | (adjective) having momentous consequences; of decisive importance | Synonyms: fatal |
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| (adjective) controlled or decreed by fate; predetermined | Synonyms: fatal |
| (adjective) ominously prophetic | Synonyms: foreboding, portentous |
| (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: black, calamitous, disastrous, fatal |
| faucal | (adjective) of or relating to the fauces | - |
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| fearful | (adjective) lacking courage; ignobly timid and faint-hearted | Synonyms: cowardly |
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| (adjective) experiencing or showing fear | - |
| (adjective) causing fear or dread or terror | Synonyms: awful, dire, direful, dread, dreaded, dreadful, fearsome, frightening, horrendous, horrific, terrible |
| (adjective) extremely distressing | Synonyms: frightful |
| (adjective) timid by nature or revealing timidity | Synonyms: timorous, trepid |
| fecal | (adjective) of or relating to feces | Synonyms: faecal |
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| federal | (adjective) characterized by or constituting a form of government in which power is divided between one central and several regional authorities | - |
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| (adjective) of or relating to the central government of a federation | - |
| (adjective) national; especially in reference to the government of the United States as distinct from that of its member units | - |
| fell | (adjective) (of persons or their actions) able or disposed to inflict pain or suffering | Synonyms: barbarous, brutal, cruel, roughshod, savage, vicious |
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| femoral | (adjective) of or relating to or near the femur or thigh | - |
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| fenestral | (adjective) of or relating to windows | - |
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| (adjective) of or relating to or having a fenestra | - |
| feral | (adjective) wild and menacing | Synonyms: ferine, savage |
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| ferial | (adjective) of or relating to or being a feria | - |
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| festal | (adjective) offering fun and gaiety | Synonyms: festive, gay, merry |
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| fetal | (adjective) of or relating to a fetus | Synonyms: foetal |
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| feudal | (adjective) of or relating to or characteristic of feudalism | Synonyms: feudalistic |
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| fictional | (adjective) related to or involving literary fiction | - |
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| (adjective) formed or conceived by the imagination | Synonyms: fabricated, fancied, fictitious |
| fiducial | (adjective) relating to or of the nature of a legal trust (i.e. the holding of something in trust for another) | Synonyms: fiduciary |
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| (adjective) used as a fixed standard of reference for comparison or measurement | - |
| (adjective) based on trust | - |
| figural | (adjective) consisting of or forming human or animal figures | Synonyms: figurative |
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| filarial | (adjective) related to or infested with or transmitting parasitic worms especially filaria | - |
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| filial | (adjective) relating to or characteristic of or befitting an offspring | - |
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| (adjective) designating the generation or the sequence of generations following the parental generation | - |
| final | (adjective) occurring at or forming an end or termination | Synonyms: concluding, last, terminal |
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| (adjective) conclusive in a process or progression | Synonyms: last, net |
| (adjective) not to be altered or undone | Synonyms: last |
| financial | (adjective) involving financial matters | Synonyms: fiscal |
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| finical | (adjective) exacting especially about details | Synonyms: finicky, fussy, particular, picky |
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| firmamental | (adjective) relating to the firmament or upper regions | - |
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| fiscal | (adjective) involving financial matters | Synonyms: financial |
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| fitful | (adjective) intermittently stopping and starting | Synonyms: interrupted, off-and-on |
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| (adjective) occurring in spells and often abruptly | Synonyms: spasmodic |
| flavorful | (adjective) full of flavor | Synonyms: flavorous, flavorsome, flavourful, flavourous, flavoursome, sapid, saporous |
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| flavourful | (adjective) full of flavor | Synonyms: flavorful, flavorous, flavorsome, flavourous, flavoursome, sapid, saporous |
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| floral | (adjective) of or relating to the plant life in a particular region | - |
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| (adjective) relating to or associated with flowers | - |
| (adjective) resembling or made of or suggestive of flowers | Synonyms: flowered |
| floricultural | (adjective) of or relating to or involving floriculture | - |
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| fluvial | (adjective) of or relating to or happening in a river | - |
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| focal | (adjective) of or relating to a focus | - |
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| (adjective) having or localized centrally at a focus | - |
| foetal | (adjective) of or relating to a fetus | Synonyms: fetal |
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| forceful | (adjective) characterized by or full of force or strength (often but not necessarily physical) | - |
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| (adjective) forceful and definite in expression or action | Synonyms: emphatic |
| foresightful | (adjective) planning prudently for the future | Synonyms: farseeing, farsighted, foresighted, long, longsighted, prospicient |
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| forethoughtful | (adjective) thoughtful of the future | - |
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| forgetful | (adjective) (of memory) deficient in retentiveness or range | Synonyms: short, unretentive |
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| (adjective) not mindful or attentive | Synonyms: mindless, unmindful |
| (adjective) failing to keep in mind | Synonyms: oblivious |
| formal | (adjective) being in accord with established forms and conventions and requirements (as e.g. of formal dress) | - |
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| (adjective) (of spoken and written language) adhering to traditional standards of correctness and without casual, contracted, and colloquial forms | - |
| (adjective) refined or imposing in manner or appearance; befitting a royal court | Synonyms: courtly, stately |
| (adjective) logically deductive | - |
| (adjective) represented in simplified or symbolic form | Synonyms: conventional, schematic |
| (adjective) characteristic of or befitting a person in authority | - |
| fossil | (adjective) characteristic of a fossil | - |
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| fossorial | (adjective) (of limbs and feet) adapted for digging | - |
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| foul | (adjective) (of a baseball) not hit between the foul lines | - |
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| (adjective) disgustingly dirty; filled or smeared with offensive matter | Synonyms: filthy, nasty |
| (adjective) characterized by obscenity | Synonyms: cruddy, filthy, nasty, smutty |
| (adjective) (of a manuscript) defaced with changes | Synonyms: dirty, marked-up |
| (adjective) offensively malodorous | Synonyms: fetid, foetid, foul-smelling, funky, ill-scented, noisome, smelly, stinking |
| (adjective) highly offensive; arousing aversion or disgust | Synonyms: disgustful, disgusting, distasteful, loathly, loathsome, repellant, repellent, repelling, revolting, skanky, wicked, yucky |
| (adjective) especially of a ship's lines etc | Synonyms: afoul, fouled |
| (adjective) violating accepted standards or rules | Synonyms: cheating, dirty, unsporting, unsportsmanlike |