| 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 | - |
| friable | (adjective) easily broken into small fragments or reduced to powder | Synonyms: crumbly |
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| gable | (noun) the vertical triangular wall between the sloping ends of gable roof | Synonyms: gable end, gable wall |
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| gabled | (adjective) (of a roof) constructed with a single slope on each side of the ridge supported at the end by a gable or vertical triangular portion of an end wall | - |
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| 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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| 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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| habitable | (adjective) fit for habitation | Synonyms: inhabitable |
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| habitableness | (noun) suitability for living in or on | Synonyms: habitability |
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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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| heptasyllable | (noun) a word or line of verse of seven syllables. | - |
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| heritable | (adjective) capable of being inherited | Synonyms: inheritable |
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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 |
| honorableness | (noun) the quality of deserving honor or respect; characterized by honor | Synonyms: honourableness |
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| 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 |
| honourableness | (noun) the quality of deserving honor or respect; characterized by honor | Synonyms: honorableness |
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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 | - |
| hospitableness | (noun) having a disposition that welcomes guests and is fond of entertaining | - |
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| hydrolyzable | (adjective) capable of undergoing hydrolysis | - |
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| identifiable | (adjective) capable of being identified | - |
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| ignitable | (adjective) capable of burning | Synonyms: burnable, ignitible |
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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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| 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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| immovable | (adjective) not able or intended to be moved | Synonyms: immoveable, stabile, unmovable |
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| (noun) property consisting of houses and land | Synonyms: real estate, real property, realty |
| immovableness | (noun) not capable of being moved or rearranged | Synonyms: immovability |
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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 | - |
| immutableness | (noun) the quality of being incapable of mutation | Synonyms: fixity, immutability |
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| 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 |
| impenetrableness | (noun) incomprehensibility by virtue of being too dense to understand | Synonyms: impenetrability |
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| imperishable | (adjective) not perishable | - |
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| (adjective) lasting a long time | Synonyms: abiding, enduring |
| imperishableness | (noun) the property of being resistant to decay | Synonyms: imperishability, imperishingness |
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| impermeable | (adjective) preventing especially liquids to pass or diffuse through | - |
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| impermeableness | (noun) the property of something that cannot be pervaded by a liquid | Synonyms: impermeability |
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| imperturbable | (adjective) not easily perturbed or excited or upset; marked by extreme calm and composure | Synonyms: unflappable |
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| imperturbableness | (noun) calm and unruffled self-assurance | Synonyms: coolness, imperturbability |
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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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| imponderable | (adjective) difficult or impossible to evaluate with precision | - |
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| (noun) a factor whose effects cannot be accurately assessed | - |
| impracticable | (adjective) not capable of being carried out or put into practice | Synonyms: infeasible, unfeasible, unworkable |
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| impracticableness | (noun) the quality of not being usable | Synonyms: impracticability |
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| impregnable | (adjective) capable of conceiving | Synonyms: conceptive |
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| (adjective) immune to attack; incapable of being tampered with | Synonyms: inviolable, secure, strong, unassailable, unattackable |
| (adjective) incapable of being overcome, challenged or refuted | Synonyms: inexpugnable |
| impressionable | (adjective) easily impressed or influenced | Synonyms: impressible, waxy |
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| improbable | (adjective) not likely to be true or to occur or to have occurred | Synonyms: unlikely |
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| (adjective) having a probability too low to inspire belief | Synonyms: unbelievable, unconvincing, unlikely |
| (adjective) too improbable to admit of belief | Synonyms: marvellous, marvelous, tall |
| improbableness | (noun) the quality of being improbable | Synonyms: improbability |
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| improvable | (adjective) susceptible of improvement | - |
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| impugnable | (adjective) subject to being discredited | - |
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| imputable | (adjective) capable of being assigned or credited to | Synonyms: ascribable, due, referable |
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| inadvisable | (adjective) not prudent or wise; not recommended | Synonyms: unadvisable |
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| (adjective) not advisable | - |
| inalienable | (adjective) incapable of being repudiated or transferred to another | Synonyms: unalienable |
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| (adjective) not subject to forfeiture | Synonyms: unforfeitable |
| inalterable | (adjective) not capable of being changed or altered | Synonyms: unalterable |
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| inapplicable | (adjective) not capable of being applied | Synonyms: unsuitable |
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| inappreciable | (adjective) too small to make a significant difference | - |
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| inarguable | (adjective) against which no argument can be made | Synonyms: unarguable |
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| incalculable | (adjective) not able to be computed or enumerated | - |
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| (adjective) too much to be measured | Synonyms: untold |
| incapable | (adjective) (followed by `of') lacking capacity or ability | - |
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| (adjective) (followed by `of') not having the temperament or inclination for | - |
| (adjective) not meeting requirements | Synonyms: incompetent, unequal to |
| (adjective) not being susceptible to or admitting of something (usually followed by `of') | - |
| incapableness | (noun) the quality of not being capable -- physically or intellectually or legally | Synonyms: incapability |
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| (noun) lack of potential for development | Synonyms: incapability |
| incognizable | (adjective) incapable of being perceived or known | Synonyms: incognoscible |
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| incommensurable | (adjective) not having a common factor | - |
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| (adjective) impossible to measure or compare in value or size or excellence | - |
| incommutable | (adjective) not subject to alteration or change | - |
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| (adjective) not interchangeable or able to substitute one for another | - |
| incomparable | (adjective) such that comparison is impossible; unsuitable for comparison or lacking features that can be compared | Synonyms: uncomparable |
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| incomputable | (adjective) beyond calculation or measure | Synonyms: immeasurable, inestimable |
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| inconceivable | (adjective) totally unlikely | Synonyms: impossible, out of the question, unimaginable |
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| inconceivableness | (noun) the state of being impossible to conceive | Synonyms: inconceivability |
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| inconsiderable | (adjective) too small or unimportant to merit attention | - |
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| inconsolable | (adjective) sad beyond comforting; incapable of being consoled | Synonyms: disconsolate, unconsolable |
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| incontestable | (adjective) incapable of being contested or disputed | Synonyms: incontestible |
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| (adjective) not open to question; obviously true | Synonyms: indisputable, undisputable |
| inculpable | (adjective) free of guilt; not subject to blame | Synonyms: blameless, irreproachable, unimpeachable |
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| inculpableness | (noun) a state of innocence | Synonyms: blamelessness, guiltlessness, inculpability |
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| incurable | (adjective) incapable of being cured | - |
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| (adjective) unalterable in disposition or habits | - |
| (noun) a person whose disease is incurable | - |
| incurableness | (noun) incapability of being cured or healed | Synonyms: incurability |
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| indecipherable | (adjective) not easily deciphered | Synonyms: unclear, undecipherable, unreadable |
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| (adjective) impossible to determine the meaning of | - |
| indefatigable | (adjective) showing sustained enthusiastic action with unflagging vitality | Synonyms: tireless, unflagging, unwearying |
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| indefatigableness | (noun) tireless determination | Synonyms: indefatigability, tirelessness |
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| indefinable | (adjective) defying expression or description | Synonyms: indescribable, ineffable, unspeakable, untellable, unutterable |
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| (adjective) not capable of being precisely or readily described; not easily put into words | Synonyms: undefinable |
| indescribable | (adjective) defying expression or description | Synonyms: indefinable, ineffable, unspeakable, untellable, unutterable |
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| indescribableness | (noun) The quality or state of being impossible, or very difficult to describe. | Synonyms: indescribability |
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| indeterminable | (adjective) not capable of being definitely decided or ascertained | Synonyms: undeterminable |
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| (adjective) incapable of being definitely ascertained or calculated | - |
| indictable | (adjective) liable to be accused, or cause for such liability | Synonyms: chargeable |
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| indispensable | (adjective) not to be dispensed with; essential | - |
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| (adjective) absolutely necessary; vitally necessary | Synonyms: essential |
| (adjective) unavoidable | - |
| indispensableness | (noun) the quality possessed by something that you cannot possibly do without | Synonyms: indispensability, vitalness |
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| indisputable | (adjective) impossible to doubt or dispute | Synonyms: sure |
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| (adjective) not open to question; obviously true | Synonyms: incontestable, undisputable |
| indistinguishable | (adjective) not capable of being distinguished or differentiated | Synonyms: undistinguishable |
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| (adjective) exactly alike; incapable of being perceived as different | Synonyms: identical |
| indomitable | (adjective) impossible to subdue | Synonyms: never-say-die, unsubduable |
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| indubitable | (adjective) too obvious to be doubted | Synonyms: beyond doubt |
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| ineffable | (adjective) defying expression or description | Synonyms: indefinable, indescribable, unspeakable, untellable, unutterable |
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| (adjective) too sacred to be uttered | Synonyms: unnameable, unspeakable, unutterable |