| imaginable | (adjective) capable of being imagined | Synonyms: conceivable |
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| imaginary | (adjective) not based on fact; existing only in the imagination | Synonyms: fanciful, notional |
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| imaginative | (adjective) (used of persons or artifacts) marked by independence and creativity in thought or action | Synonyms: inventive |
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| inaccessible | (adjective) capable of being reached only with great difficulty or not at all | Synonyms: unaccessible |
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| (adjective) not capable of being obtained | Synonyms: unobtainable, unprocurable, untouchable |
| inaccurate | (adjective) erroneous | - |
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| 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 | - |
| inadequate | (adjective) lacking the requisite qualities or resources to meet a task | Synonyms: unequal |
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| (adjective) of insufficient quantity to meet a need | Synonyms: jejune, poor, short |
| inadmissible | (adjective) not deserving to be admitted | - |
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| inadvertent | (adjective) happening by chance or unexpectedly or unintentionally | Synonyms: accidental |
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| inadvisable | (adjective) not prudent or wise; not recommended | Synonyms: unadvisable |
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| (adjective) not advisable | - |
| inaesthetic | (adjective) violating aesthetic canons or requirements; deficient in tastefulness or beauty | Synonyms: unaesthetic |
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| 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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| inane | (adjective) extremely silly or stupid | Synonyms: asinine, fatuous |
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| inanimate | (adjective) not endowed with life | Synonyms: non-living, nonliving |
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| (adjective) belonging to the class of nouns denoting nonliving things | - |
| (adjective) appearing dead; not breathing or having no perceptible pulse | Synonyms: breathless, pulseless |
| inapplicable | (adjective) not capable of being applied | Synonyms: unsuitable |
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| inapposite | (adjective) of an inappropriate or misapplied nature | Synonyms: out of place |
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| inappreciable | (adjective) too small to make a significant difference | - |
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| inappropriate | (adjective) not suitable for a particular occasion etc | - |
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| (adjective) not in keeping with what is correct or proper | Synonyms: incompatible, out of keeping, unfitting |
| inapt | (adjective) not elegant or graceful in expression | Synonyms: awkward, clumsy, cumbersome, ill-chosen, inept |
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| inarguable | (adjective) against which no argument can be made | Synonyms: unarguable |
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| inarticulate | (adjective) without or deprived of the use of speech or words | Synonyms: unarticulate |
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| inartistic | (adjective) lacking aesthetic sensibility | Synonyms: unartistic |
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| inattentive | (adjective) showing a lack of attention or care | - |
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| (adjective) not showing due care or attention | Synonyms: neglectful |
| inaudible | (adjective) impossible to hear; imperceptible by the ear | Synonyms: unhearable |
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| inaugural | (adjective) occurring at or characteristic of a formal investiture or induction | - |
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| (adjective) serving to set in motion | Synonyms: first, initiative, initiatory, maiden |
| inauspicious | (adjective) not auspicious; boding ill | Synonyms: unfortunate |
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| (adjective) contrary to your interests or welfare | Synonyms: adverse, untoward |
| (adjective) presaging ill fortune | Synonyms: ill, ominous |
| inauthentic | (adjective) false or fake; not what it appears to be | Synonyms: spurious, unauthentic |
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| incriminating | (adjective) charging or suggestive of guilt or blame | Synonyms: criminative, criminatory, incriminatory |
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| incriminatory | (adjective) charging or suggestive of guilt or blame | Synonyms: criminative, criminatory, incriminating |
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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 |
| indeterminable | (adjective) not capable of being definitely decided or ascertained | Synonyms: undeterminable |
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| (adjective) incapable of being definitely ascertained or calculated | - |
| indeterminate | (adjective) not precisely determined or established; not fixed or known in advance | Synonyms: undetermined |
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| (adjective) having a capacity for continuing to grow at the apex | - |
| (adjective) of uncertain or ambiguous nature | - |
| (adjective) not leading to a definite ending or result | - |
| (adjective) (of a quantity) having no definite value, as an equation that cannot be solved | - |
| indiscriminate | (adjective) not marked by fine distinctions | - |
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| (adjective) failing to make or recognize distinctions | - |
| indiscriminating | (adjective) not discriminating | Synonyms: undiscriminating |
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| inexterminable | (adjective) incapable of extermination or extirpation | Synonyms: inextirpable |
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| inguinal | (adjective) of or relating to or near the groin | - |
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| inordinate | (adjective) beyond normal limits | Synonyms: excessive, undue, unreasonable |
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| insubordinate | (adjective) not submissive to authority | - |
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| (adjective) disposed to or engaged in defiance of established authority | Synonyms: resistant, resistive |
| interdenominational | (adjective) occurring between or among or common to different churches or denominations | Synonyms: interchurch |
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| interdisciplinary | (adjective) drawing from or characterized by participation of two or more fields of study | - |
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| interminable | (adjective) tiresomely long; seemingly without end | Synonyms: endless, eternal |
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| intestinal | (adjective) of or relating to or inside the intestines | Synonyms: enteral, enteric |
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| iodinated | (adjective) treated with iodine | Synonyms: iodised, iodized |
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| iodinating | (adjective) combining or causing to combine with iodine | - |
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| isoclinal | (adjective) having equal magnetic inclinations | Synonyms: isoclinic |
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| kinaesthetic | (adjective) of or relating to kinesthesis | Synonyms: kinesthetic |
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| laminal | (adjective) arranged in or consisting of laminae | Synonyms: laminar |
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| laminar | (adjective) arranged in or consisting of laminae | Synonyms: laminal |
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| lancinate | (adjective) painful as if caused by a sharp instrument | Synonyms: cutting, keen, knifelike, lancinating, piercing, stabbing |
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| lancinating | (adjective) painful as if caused by a sharp instrument | Synonyms: cutting, keen, knifelike, lancinate, piercing, stabbing |
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| latinate | (adjective) derived from or imitative of Latin | - |
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| latitudinal | (adjective) of or relating to latitudes north or south | - |
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| latitudinarian | (adjective) unwilling to accept authority or dogma (especially in religion) | Synonyms: free-thinking, undogmatic, undogmatical |
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| libidinal | (adjective) belonging to the libido | - |
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| longitudinal | (adjective) of or relating to lines of longitude | - |
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| (adjective) running lengthwise | - |
| (adjective) over an extended time | - |
| maintainable | (adjective) capable of being maintained | - |
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| marginal | (adjective) of questionable or minimal quality | Synonyms: borderline |
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| (adjective) just barely adequate or within a lower limit | Synonyms: bare |
| (adjective) at or constituting a border or edge | Synonyms: fringy |
| (adjective) producing at a rate that barely covers production costs | - |
| matutinal | (adjective) pertaining to or occurring in the morning | - |
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| medicinal | (adjective) having the properties of medicine | Synonyms: medicative |
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| minacious | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, menacing, minatory, ominous, sinister, threatening |
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| minatory | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, menacing, minacious, ominous, sinister, threatening |
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| monoclinal | (adjective) of a geological structure in which all strata are inclined in the same direction | - |
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| multinational | (adjective) involving or operating in several nations or nationalities | Synonyms: transnational |
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| myelinated | (adjective) (of neurons) covered with a layer of myelin | Synonyms: medullated |
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| nominal | (adjective) of, relating to, or characteristic of an amount that is not adjusted for inflation | - |
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| (adjective) pertaining to a noun or to a word group that functions as a noun | - |
| (adjective) relating to or constituting or bearing or giving a name | - |
| (adjective) existing in name only | Synonyms: titular |
| (adjective) insignificantly small; a matter of form only (`tokenish' is informal) | Synonyms: token, tokenish |
| (adjective) named; bearing the name of a specific person | Synonyms: nominative |
| nominalistic | (adjective) of or relating to nominalism | - |
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| nominated | (adjective) appointed by nomination | Synonyms: nominative |
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| nominative | (adjective) serving as or indicating the subject of a verb and words identified with the subject of a copular verb | - |
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| (adjective) appointed by nomination | Synonyms: nominated |
| (adjective) named; bearing the name of a specific person | Synonyms: nominal |
| noncombinative | (adjective) not involving combination | - |
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| nondenominational | (adjective) not restricted to a particular religious denomination | - |
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| nonfinancial | (adjective) not involving financial matters | - |
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| nonmedicinal | (adjective) not having a medicinal effect or not medically prescribed | Synonyms: unmedical, unmedicative, unmedicinal |
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| nonruminant | (adjective) not ruminant | - |
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| obstinate | (adjective) tenaciously unwilling or marked by tenacious unwillingness to yield | Synonyms: stubborn, unregenerate |
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| (adjective) resistant to guidance or discipline | Synonyms: contrary, perverse, wayward |
| (adjective) stubbornly persistent in wrongdoing | Synonyms: cussed, obdurate, unrepentant |
| obtainable | (adjective) capable of being obtained | Synonyms: getable, gettable, procurable |
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| ordinal | (adjective) being or denoting a numerical order in a series | - |
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| (adjective) of or relating to a taxonomic order | - |
| ordinary | (adjective) not exceptional in any way especially in quality or ability or size or degree | - |
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| (adjective) lacking special distinction, rank, or status; commonly encountered | Synonyms: average |
| original | (adjective) being or productive of something fresh and unusual; or being as first made or thought of | - |
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| (adjective) (of e.g. information) not secondhand or by way of something intermediary | - |
| (adjective) not derived or copied or translated from something else | - |
| (adjective) preceding all others in time or being as first made or performed | - |
| originative | (adjective) having the ability or power to create | Synonyms: creative |
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| (adjective) containing seeds of later development | Synonyms: germinal, seminal |
| pectinate | (adjective) like a comb | - |
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| perinasal | (adjective) near the nose | Synonyms: perirhinal |
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| perinatal | (adjective) occurring during the period around birth (5 months before and 1 month after) | - |
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| perirhinal | (adjective) near the nose | Synonyms: perinasal |
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| pertinacious | (adjective) stubbornly unyielding | Synonyms: dogged, dour, persistent, tenacious, unyielding |
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| platitudinal | (adjective) dull and tiresome but with pretensions of significance or originality | Synonyms: bromidic, corny, platitudinous |
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| plumbaginaceous | (adjective) of or pertaining to or characteristic of plants of the family Plumbaginaceae | - |
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| predestinarian | (adjective) of or relating to predestination; holding the doctrine of predestination | - |
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| predestinate | (adjective) established or prearranged unalterably | Synonyms: foreordained, predestined |
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| predominant | (adjective) having superior power and influence | Synonyms: overriding, paramount, predominate, preponderant, preponderating |
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| (adjective) most frequent or common | Synonyms: dominant, prevailing, prevalent, rife |
| predominate | (adjective) having superior power and influence | Synonyms: overriding, paramount, predominant, preponderant, preponderating |
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| preliminary | (adjective) denoting an action or event preceding or in preparation for something more important | - |
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| prenominal | (adjective) of adjectives; placed before the nouns they modify | Synonyms: attributive |
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| pronominal | (adjective) relating to pronouns | - |
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| proteinaceous | (adjective) relating to or of the nature of protein | - |
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| ratiocinative | (adjective) based on exact thinking | - |
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| recombinant | (adjective) of or relating to recombinant DNA | - |
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| recriminative | (adjective) countering one charge with another | Synonyms: recriminatory |
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| recriminatory | (adjective) countering one charge with another | Synonyms: recriminative |
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| resinated | (adjective) impregnated or flavored with resin | - |
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