| exterminable | (adjective) capable of being totally destroyed or wiped out | Synonyms: extirpable |
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| extinguishable | (adjective) capable of being extinguished or killed | - |
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| extirpable | (adjective) capable of being totally destroyed or wiped out | Synonyms: exterminable |
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| extractable | (adjective) capable of being extracted | Synonyms: extractible |
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| extractible | (adjective) capable of being extracted | Synonyms: extractable |
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| extricable | (adjective) capable of being extricated | - |
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| facile | (adjective) expressing yourself readily, clearly, effectively | Synonyms: eloquent, fluent, silver-tongued, silver, smooth-spoken |
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| (adjective) performing adroitly and without effort | - |
| (adjective) superficially impressive, but lacking depth and attention to the true complexities of a subject | Synonyms: neat, slick |
| fallible | (adjective) likely to fail or make errors | - |
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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: frail, imperfect, weak |
| falsifiable | (adjective) capable of being tested (verified or falsified) by experiment or observation | Synonyms: confirmable, verifiable |
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| fashionable | (adjective) being or in accordance with current social fashions | Synonyms: stylish |
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| (adjective) having elegance or taste or refinement in manners or dress | Synonyms: stylish |
| (adjective) popular and considered appealing or fashionable at the time | Synonyms: in fashion |
| fathomable | (adjective) (of depth) capable of being sounded or measured for depth | Synonyms: plumbable, soundable |
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| (adjective) (of meaning) capable of being penetrated or comprehended | - |
| favorable | (adjective) (of winds or weather) tending to promote or facilitate | Synonyms: favourable |
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| (adjective) encouraging or approving or pleasing | Synonyms: favourable |
| (adjective) giving an advantage | Synonyms: advantageous, favourable |
| (adjective) presaging or likely to bring good luck or a good outcome | Synonyms: favourable, golden, lucky, prosperous |
| favourable | (adjective) (of winds or weather) tending to promote or facilitate | Synonyms: favorable |
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| (adjective) encouraging or approving or pleasing | Synonyms: favorable |
| (adjective) giving an advantage | Synonyms: advantageous, favorable |
| (adjective) presaging or likely to bring good luck or a good outcome | Synonyms: favorable, golden, lucky, prosperous |
| feasible | (adjective) capable of being done with means at hand and circumstances as they are | Synonyms: executable, practicable, viable, workable |
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| febrile | (adjective) of or relating to or characterized by fever | Synonyms: feverish |
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| feeble | (adjective) lacking bodily or muscular strength or vitality | Synonyms: debile, decrepit, infirm, rickety, sapless, weak, weakly |
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| (adjective) lacking strength | Synonyms: nerveless |
| (adjective) lacking strength or vigor | Synonyms: faint |
| (adjective) pathetically lacking in force or effectiveness | Synonyms: lame |
| female | (adjective) being the sex (of plant or animal) that produces fertilizable gametes (ova) from which offspring develop | - |
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| (adjective) for or pertaining to or composed of women or girls | - |
| (adjective) characteristic of or peculiar to a woman | Synonyms: distaff |
| fermentable | (adjective) capable of being fermented | - |
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| fertile | (adjective) capable of reproducing | - |
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| (adjective) marked by great fruitfulness | Synonyms: fat, productive, rich |
| (adjective) bearing in abundance especially offspring | Synonyms: prolific |
| (adjective) intellectually productive | Synonyms: fecund, prolific |
| fertilizable | (adjective) capable of being fertilized | - |
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| fickle | (adjective) liable to sudden unpredictable change | Synonyms: erratic, mercurial, quicksilver |
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| (adjective) marked by erratic changeableness in affections or attachments | Synonyms: volatile |
| 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 |
| filmable | (adjective) (used of a story or literary work) capable of being adapted to motion picture form | - |
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| finable | (adjective) liable to a fine | Synonyms: fineable |
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| fineable | (adjective) liable to a fine | Synonyms: finable |
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| fissile | (adjective) capable of being split or cleft or divided in the direction of the grain | - |
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| (adjective) capable of undergoing nuclear fission | Synonyms: fissionable |
| fissionable | (adjective) capable of undergoing nuclear fission | Synonyms: fissile |
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| flammable | (adjective) easily ignited | Synonyms: inflammable |
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| fleeceable | (adjective) naive and easily deceived or tricked | Synonyms: green, gullible |
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| flexible | (adjective) able to flex; able to bend easily | Synonyms: flexile |
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| (adjective) capable of being changed | - |
| (adjective) making or willing to make concessions | Synonyms: compromising, conciliatory |
| (adjective) able to adjust readily to different conditions | Synonyms: elastic, pliable, pliant |
| (adjective) bending and snapping back readily without breaking | Synonyms: whippy |
| flexile | (adjective) able to flex; able to bend easily | Synonyms: flexible |
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| foldable | (adjective) capable of being folded up and stored | Synonyms: foldaway, folding |
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| forcible | (adjective) impelled by physical force especially against resistance | Synonyms: physical, strong-arm |
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| fordable | (adjective) shallow enough to be crossed by walking or riding on an animal or in a vehicle | - |
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| foreseeable | (adjective) capable of being anticipated | - |
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| forgettable | (adjective) easily forgotten | - |
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| forgivable | (adjective) easily excused or forgiven | Synonyms: excusable, venial |
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| formidable | (adjective) inspiring fear | Synonyms: redoubtable, unnerving |
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| (adjective) extremely impressive in strength or excellence | - |
| fragile | (adjective) easily broken or damaged or destroyed | Synonyms: delicate, frail |
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| (adjective) vulnerably delicate | - |
| (adjective) lacking substance or significance | Synonyms: flimsy, slight, tenuous, thin |
| frangible | (adjective) capable of being broken | - |
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| friable | (adjective) easily broken into small fragments or reduced to powder | Synonyms: crumbly |
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| fungible | (adjective) of goods or commodities; freely exchangeable for or replaceable by another of like nature or kind in the satisfaction of an obligation | - |
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| fusible | (adjective) capable of being melted and fused | - |
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| futile | (adjective) unproductive of success | Synonyms: bootless, fruitless, sleeveless, vain |
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| (adjective) producing no result or effect | Synonyms: ineffectual, meaningless, otiose, unavailing |
| gentile | (adjective) belonging to or characteristic of non-Jewish peoples | - |
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| gentle | (adjective) marked by moderate steepness | Synonyms: easy |
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| (adjective) having little impact | Synonyms: easy, soft |
| (adjective) soft and mild; not harsh or stern or severe | Synonyms: soft |
| (adjective) belonging to or characteristic of the nobility or aristocracy | Synonyms: aristocratic, aristocratical, blue-blooded, blue, patrician |
| (adjective) quiet and soothing | - |
| (adjective) easily handled or managed | Synonyms: docile |
| (adjective) having or showing a kindly or tender nature | - |
| getable | (adjective) capable of being obtained | Synonyms: gettable, obtainable, procurable |
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| getatable | (adjective) capable of being reached or attained | Synonyms: come-at-able, get-at-able |
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| gettable | (adjective) capable of being obtained | Synonyms: getable, obtainable, procurable |
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| governable | (adjective) capable of being controlled | Synonyms: controllable |
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| gracile | (adjective) slender and graceful | Synonyms: willowy |
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| gradable | (adjective) capable of being graded (for quality or rank or size etc.) | - |
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| graspable | (adjective) capable of being apprehended or understood | Synonyms: apprehensible, intelligible, perceivable, understandable |
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| gullible | (adjective) naive and easily deceived or tricked | Synonyms: fleeceable, green |
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| (adjective) easily tricked because of being too trusting | - |
| habitable | (adjective) fit for habitation | Synonyms: inhabitable |
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| hale | (adjective) exhibiting or restored to vigorous good health | Synonyms: whole |
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| hardscrabble | (adjective) barely satisfying a lower standard | - |
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| harmonizable | (adjective) capable of being made harmonious or consistent | - |
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| hearable | (adjective) heard or perceptible by the ear | Synonyms: audible |
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| heatable | (adjective) capable of becoming hot | - |
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| heritable | (adjective) capable of being inherited | Synonyms: inheritable |
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| homophile | (adjective) homosexual or arousing homosexual desires | Synonyms: gay, queer |
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| honorable | (adjective) worthy of being honored; entitled to honor and respect | Synonyms: honourable |
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| (adjective) not disposed to cheat or defraud; not deceptive or fraudulent; marked by truth | Synonyms: honest |
| (adjective) deserving of esteem and respect | Synonyms: admirable, estimable, good, respectable |
| (adjective) adhering to ethical and moral principles | Synonyms: ethical, honourable |
| honourable | (adjective) worthy of being honored; entitled to honor and respect | Synonyms: honorable |
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| (adjective) adhering to ethical and moral principles | Synonyms: ethical, honorable |
| horrible | (adjective) provoking horror | Synonyms: atrocious, frightful, horrifying, ugly |
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| hospitable | (adjective) favorable to life and growth | - |
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| (adjective) disposed to treat guests and strangers with cordiality and generosity | - |
| (adjective) having an open mind | - |
| hostile | (adjective) characterized by enmity or ill will | - |
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| (adjective) not belonging to your own country's forces or those of an ally | - |
| (adjective) unsolicited and resisted by the management of the target company (used of attempts to buy or take control of a business) | - |
| (adjective) very unfavorable to life or growth | Synonyms: uncongenial, unfriendly |
| (adjective) impossible to bring into friendly accord | - |
| humble | (adjective) marked by meekness or modesty; not arrogant or prideful | - |
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| (adjective) low or inferior in station or quality | Synonyms: low, lowly, modest, small |
| (adjective) of low birth or station (`base' is archaic in this sense) | Synonyms: base, baseborn, lowly |
| (adjective) used of unskilled work (especially domestic work) | Synonyms: lowly, menial |
| hydrolyzable | (adjective) capable of undergoing hydrolysis | - |
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| identifiable | (adjective) capable of being identified | - |
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| idle | (adjective) not in action or at work | - |
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| (adjective) silly or trivial | Synonyms: light |
| (adjective) not in active use | Synonyms: unused |
| (adjective) lacking a sense of restraint or responsibility | Synonyms: loose |
| (adjective) not having a job | Synonyms: jobless, out of work |
| (adjective) not yielding a return | Synonyms: dead |
| (adjective) without a basis in reason or fact | Synonyms: baseless, groundless, unfounded, unwarranted, wild |
| ignitable | (adjective) capable of burning | Synonyms: burnable, ignitible |
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| ignitible | (adjective) capable of burning | Synonyms: burnable, ignitable |
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| ignoble | (adjective) completely lacking nobility in character or quality or purpose | - |
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| (adjective) not of the nobility | Synonyms: ungentle, untitled |
| illegible | (adjective) (of handwriting, print, etc.) not legible | - |
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| illimitable | (adjective) without limits in extent or size or quantity | Synonyms: limitless, measureless, unmeasured |
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| imaginable | (adjective) capable of being imagined | Synonyms: conceivable |
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| imbecile | (adjective) having a mental age of three to seven years | Synonyms: idiotic, imbecilic |
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| immeasurable | (adjective) impossible to measure | Synonyms: immensurable, unmeasurable |
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| (adjective) beyond calculation or measure | Synonyms: incomputable, inestimable |
| immensurable | (adjective) impossible to measure | Synonyms: immeasurable, unmeasurable |
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| immiscible | (adjective) (chemistry, physics) incapable of mixing | Synonyms: non-miscible, unmixable |
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| immobile | (adjective) not capable of movement or of being moved | - |
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| (adjective) securely fixed in place | Synonyms: fast, firm |
| immotile | (adjective) (of spores or microorganisms) not capable of movement | Synonyms: nonmotile |
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| immovable | (adjective) not able or intended to be moved | Synonyms: immoveable, stabile, unmovable |
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| immoveable | (adjective) not able or intended to be moved | Synonyms: immovable, stabile, unmovable |
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| immutable | (adjective) not subject or susceptible to change or variation in form or quality or nature | Synonyms: changeless |
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| (adjective) constant and unchanging | - |
| impalpable | (adjective) imperceptible to the senses or the mind | - |
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| (adjective) incapable of being perceived by the senses especially the sense of touch | Synonyms: intangible |
| (adjective) not perceptible to the touch | - |
| impassable | (adjective) incapable of being passed | Synonyms: unpassable |
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| impeccable | (adjective) without fault or error | Synonyms: faultless, immaculate, incorrupted |
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| (adjective) not capable of sin | - |
| impenetrable | (adjective) not admitting of penetration or passage into or through | - |
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| (adjective) impossible to understand | - |
| (adjective) permitting little if any light to pass through because of denseness of matter | Synonyms: dense, heavy |
| imperceptible | (adjective) impossible or difficult to perceive by the mind or senses | Synonyms: unperceivable |
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| imperfectible | (adjective) capable of being made imperfect | - |
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| imperishable | (adjective) not perishable | - |
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| (adjective) lasting a long time | Synonyms: abiding, enduring |
| impermeable | (adjective) preventing especially liquids to pass or diffuse through | - |
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| impermissible | (adjective) not permitted | - |
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| (adjective) not allowable | - |
| imperturbable | (adjective) not easily perturbed or excited or upset; marked by extreme calm and composure | Synonyms: unflappable |
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| imperviable | (adjective) not admitting of passage or capable of being affected | Synonyms: impervious |
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| implacable | (adjective) incapable of being placated | - |
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| implausible | (adjective) having a quality that provokes disbelief | - |
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| imponderable | (adjective) difficult or impossible to evaluate with precision | - |
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