| ductile | (adjective) capable of being shaped or bent or drawn out | Synonyms: malleable, pliable, pliant, tensile, tractile |
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| (adjective) easily influenced | Synonyms: malleable |
| ductless | (adjective) not having a duct | - |
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| dysfunctional | (adjective) impaired in function; especially of a bodily system or organ | - |
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| (adjective) (of a trait or condition) failing to serve an adjustive purpose | Synonyms: nonadaptive |
| dyslectic | (adjective) having impaired ability to comprehend written words usually associated with a neurologic disorder | Synonyms: dyslexic |
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| ebracteate | (adjective) without bracts | - |
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| eclectic | (adjective) selecting what seems best of various styles or ideas | - |
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| ectodermal | (adjective) of or relating to the ectoderm | Synonyms: ectodermic |
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| ectodermic | (adjective) of or relating to the ectoderm | Synonyms: ectodermal |
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| ectomorphic | (adjective) having a build with little fat or muscle but with long limbs | - |
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| ectopic | (adjective) exhibiting ectopia | - |
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| ectothermic | (adjective) of animals except birds and mammals; having body temperature that varies with the environment | Synonyms: heterothermic, poikilothermic, poikilothermous |
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| ectozoan | (adjective) of or relating to epizoa | Synonyms: epizoan |
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| effected | (adjective) settled securely and unconditionally | Synonyms: accomplished, established |
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| effective | (adjective) producing or capable of producing an intended result or having a striking effect | Synonyms: effectual, efficacious |
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| (adjective) existing in fact; not theoretical; real | - |
| (adjective) able to accomplish a purpose; functioning effectively | Synonyms: efficient |
| (adjective) works well as a means or remedy | - |
| (adjective) ready for service | - |
| (adjective) exerting force or influence | Synonyms: good, in effect, in force |
| effectual | (adjective) producing or capable of producing an intended result or having a striking effect | Synonyms: effective, efficacious |
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| (adjective) having legal efficacy or force | Synonyms: legal, sound |
| elect | (adjective) elected but not yet installed in office | - |
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| (adjective) selected as the best | Synonyms: elite |
| elected | (adjective) subject to popular election | Synonyms: elective |
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| elective | (adjective) subject to popular election | Synonyms: elected |
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| (adjective) optional | Synonyms: facultative |
| electoral | (adjective) of or relating to elections | - |
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| (adjective) relating to or composed of electors | - |
| electric | (adjective) using or providing or producing or transmitting or operated by electricity | Synonyms: electrical |
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| (adjective) affected by emotion as if by electricity; thrilling | Synonyms: galvanic, galvanising, galvanizing |
| (adjective) (of a situation) exceptionally tense | - |
| electrical | (adjective) relating to or concerned with electricity | - |
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| (adjective) using or providing or producing or transmitting or operated by electricity | Synonyms: electric |
| electrifying | (adjective) causing a surge of emotion or excitement | Synonyms: thrilling |
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| electrocardiographic | (adjective) of or relating to an electrocardiograph | - |
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| electrochemical | (adjective) of or involving electrochemistry | - |
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| electroencephalographic | (adjective) of or relating to an electroencephalograph | - |
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| electrolytic | (adjective) of or relating to or containing an electrolyte | - |
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| (adjective) of or concerned with or produced by electrolysis | - |
| electromagnetic | (adjective) pertaining to or exhibiting magnetism produced by electric charge in motion | - |
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| electromechanical | (adjective) of or relating to or involving an electrically operated mechanical device | - |
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| electromotive | (adjective) concerned with or producing electric current | - |
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| electronegative | (adjective) having a negative charge | Synonyms: negative, negatively charged |
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| electroneutral | (adjective) having no net electric charge | Synonyms: neutral |
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| electronic | (adjective) of or relating to electronics; concerned with or using devices that operate on principles governing the behavior of electrons | - |
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| (adjective) of or concerned with electrons | - |
| electrophoretic | (adjective) of or relating to electrophoresis | Synonyms: cataphoretic |
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| electropositive | (adjective) having a positive charge | Synonyms: positive, positively charged |
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| electrostatic | (adjective) concerned with or producing or caused by static electricity | Synonyms: static |
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| epideictic | (adjective) designed primarily for rhetorical display | Synonyms: epideictical |
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| epideictical | (adjective) designed primarily for rhetorical display | Synonyms: epideictic |
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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 | - |
| erect | (adjective) upright in position or posture | Synonyms: upright, vertical |
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| (adjective) of sexual organs; stiff and rigid | Synonyms: tumid |
| erectile | (adjective) capable of being raised to an upright position | - |
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| (adjective) filled with vascular sinuses and capable of becoming distended and rigid as the result of being filled with blood | Synonyms: cavernous |
| exact | (adjective) marked by strict and particular and complete accordance with fact | - |
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| (adjective) (of ideas, images, representations, expressions) characterized by perfect conformity to fact or truth; strictly correct | Synonyms: accurate, precise |
| (adjective) lacking compromising or mitigating elements | Synonyms: direct |
| exacting | (adjective) having complicated nutritional requirements; especially growing only in special artificial cultures | Synonyms: fastidious |
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| (adjective) requiring precise accuracy | Synonyms: exigent |
| (adjective) severe and unremitting in making demands | Synonyms: stern, strict |
| expectable | (adjective) to be expected | - |
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| expectant | (adjective) marked by eager anticipation | Synonyms: anticipant, anticipative |
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| (adjective) in an advanced stage of pregnancy | Synonyms: big, enceinte, gravid, great, heavy, large, with child |
| expected | (adjective) considered likely or probable to happen or arrive | - |
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| extinct | (adjective) no longer in existence; lost or especially having died out leaving no living representatives | Synonyms: nonextant |
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| (adjective) (of e.g. volcanoes) permanently inactive | - |
| (adjective) being out or having grown cold | Synonyms: out |
| extractable | (adjective) capable of being extracted | Synonyms: extractible |
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| extractible | (adjective) capable of being extracted | Synonyms: extractable |
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| extragalactic | (adjective) outside or beyond a galaxy | - |
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| extrospective | (adjective) not introspective; examining what is outside yourself | Synonyms: extroverted |
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| factious | (adjective) dissenting (especially dissenting with the majority opinion) | Synonyms: dissentious, divisive |
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| factitious | (adjective) not produced by natural forces | - |
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| 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 |
| fictile | (adjective) of or relating to the craft of pottery | - |
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| (adjective) capable of being molded or modeled (especially of earth or clay or other soft material) | Synonyms: moldable, plastic |
| (adjective) susceptible to being led or directed | Synonyms: pliable |
| fictional | (adjective) related to or involving literary fiction | - |
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| (adjective) formed or conceived by the imagination | Synonyms: fabricated, fancied, fictitious |
| fictitious | (adjective) adopted in order to deceive | Synonyms: assumed, false, fictive, pretended, put on, sham |
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| (adjective) formed or conceived by the imagination | Synonyms: fabricated, fancied, fictional |
| fictive | (adjective) adopted in order to deceive | Synonyms: assumed, false, fictitious, pretended, put on, sham |
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| (adjective) capable of imaginative creation | - |
| fluctuating | (adjective) having unpredictable ups and downs | - |
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| fractional | (adjective) constituting or comprising a part or fraction of a possible whole or entirety | Synonyms: partial |
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| (adjective) constituting a division or an aliquot part of the basic monetary unit | Synonyms: divisional |
| fractious | (adjective) unpredictably difficult in operation; likely to be troublesome | - |
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| (adjective) stubbornly resistant to authority or control | Synonyms: recalcitrant, refractory |
| (adjective) easily irritated or annoyed | Synonyms: cranky, irritable, nettlesome, peckish, peevish, pettish, petulant, scratchy, techy, testy, tetchy |
| frictional | (adjective) pertaining to or worked or produced by friction | - |
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| frictionless | (adjective) lacking all friction | - |
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| functional | (adjective) designed for or capable of a particular function or use | - |
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| (adjective) involving or affecting function rather than physiology | - |
| (adjective) relating to or based on function especially as opposed to structure | - |
| (adjective) (of e.g. a machine) performing or capable of performing | Synonyms: operative, running, working |
| (adjective) designed for or adapted to a function or use | - |
| (adjective) fit or ready for use or service | Synonyms: operable, operational, usable, useable |
| functioning | (adjective) performing or able to perform its regular function | - |
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| galactic | (adjective) of or relating to a galaxy (especially our galaxy the Milky Way) | - |
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| (adjective) inconceivably large | Synonyms: astronomic, astronomical |
| hectic | (adjective) marked by intense agitation or emotion | Synonyms: feverish |
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| heterodactyl | (adjective) (of bird feet) having the first and second toes directed backward the third and fourth forward | - |
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| hydroelectric | (adjective) of or relating to or used in the production of electricity by waterpower | - |
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| hyperactive | (adjective) more active than normal | Synonyms: overactive |
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| hypercatalectic | (adjective) (verse) having an extra syllable or syllables at the end of a metrically complete verse or in a metrical foot | - |
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| hypoactive | (adjective) abnormally inactive | Synonyms: underactive |
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| hypophysectomised | (adjective) having the pituitary gland removed by surgery | Synonyms: hypophysectomized |
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| hypophysectomized | (adjective) having the pituitary gland removed by surgery | Synonyms: hypophysectomised |
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| ictal | (adjective) of or relating to a seizure or convulsion | Synonyms: ictic |
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| icteric | (adjective) affected by jaundice which causes yellowing of skin etc | Synonyms: jaundiced, yellow |
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| icterogenic | (adjective) producing jaundice | - |
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| ictic | (adjective) of or relating to a seizure or convulsion | Synonyms: ictal |
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| impacted | (adjective) wedged or packed in together | Synonyms: wedged |
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| imperfect | (adjective) not perfect; defective or inadequate | - |
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| (adjective) wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings | Synonyms: fallible, frail, weak |
| imperfectible | (adjective) capable of being made imperfect | - |
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| impracticable | (adjective) not capable of being carried out or put into practice | Synonyms: infeasible, unfeasible, unworkable |
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| impractical | (adjective) not practical; not workable or not given to practical matters | - |
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| (adjective) not practical or realizable; speculative | Synonyms: airy, Laputan, visionary, windy |
| inactive | (adjective) (military) not involved in military operations | Synonyms: nonoperational |
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| (adjective) not active physically or mentally | - |
| (adjective) (pathology) not progressing or increasing; or progressing slowly | - |
| (adjective) lacking activity; lying idle or unused | - |
| (adjective) lacking in energy or will | Synonyms: passive |
| (adjective) (of e.g. volcanoes) not erupting and not extinct | Synonyms: dormant |
| (adjective) not exerting influence or change | - |
| (adjective) not engaged in full-time work | - |
| (adjective) not in physical motion | Synonyms: motionless, static, still |
| (adjective) (chemistry) not participating in a chemical reaction; chemically inert | - |
| incorrect | (adjective) not correct; not in conformity with fact or truth | Synonyms: wrong |
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| (adjective) not in accord with established usage or procedure | Synonyms: wrong |
| (adjective) characterized by errors; not agreeing with a model or not following established rules | Synonyms: faulty, wrong |
| (adjective) (of a word or expression) not agreeing with grammatical principles | - |
| indestructible | (adjective) not easily destroyed | - |
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| (adjective) very long lasting | Synonyms: durable, perdurable, undestroyable |
| indictable | (adjective) liable to be accused, or cause for such liability | Synonyms: chargeable |
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| indirect | (adjective) not direct in spatial dimension; not leading by a straight line or course to a destination | - |
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| (adjective) extended senses; not direct in manner or language or behavior or action | - |
| (adjective) descended from a common ancestor but through different lines | Synonyms: collateral |
| (adjective) having intervening factors or persons or influences | - |
| (adjective) not as a direct effect or consequence | - |
| indistinct | (adjective) not clearly defined or easy to perceive or understand | - |
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| inductive | (adjective) of reasoning; proceeding from particular facts to a general conclusion | - |
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| (adjective) arising from inductance | - |
| (adjective) inducing or influencing; leading on | Synonyms: inducive |
| ineffective | (adjective) not producing an intended effect | Synonyms: ineffectual, uneffective |
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| (adjective) lacking in power or forcefulness | Synonyms: ineffectual, unable |
| (adjective) lacking the ability or skill to perform effectively; inadequate | Synonyms: inefficient |
| ineffectual | (adjective) not producing an intended effect | Synonyms: ineffective, uneffective |
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| (adjective) lacking in power or forcefulness | Synonyms: ineffective, unable |
| (adjective) producing no result or effect | Synonyms: futile, meaningless, otiose, unavailing |
| ineluctable | (adjective) impossible to avoid or evade | Synonyms: inescapable, unavoidable |
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| inexact | (adjective) not exact | - |
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| infected | (adjective) containing or resulting from disease-causing organisms | Synonyms: septic |
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| infectious | (adjective) easily spread | - |
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| (adjective) of or relating to infection | - |
| (adjective) caused by infection or capable of causing infection | Synonyms: infective |
| infective | (adjective) caused by infection or capable of causing infection | Synonyms: infectious |
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| (adjective) able to cause disease | Synonyms: morbific, pathogenic |
| inflected | (adjective) (of the voice) altered in tone or pitch | - |
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| (adjective) showing alteration in form (especially by the addition of affixes) | - |
| inflectional | (adjective) characterized by inflections indicating grammatical distinctions | - |
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| injectable | (adjective) (used of drugs) capable of being injected | - |
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