| granuliferous | (adjective) producing or full of granules | - |
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| granulomatous | (adjective) relating to or characterized by granulomas | - |
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| gratuitous | (adjective) without cause | - |
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| (adjective) unnecessary and unwarranted | Synonyms: needless, uncalled-for |
| (adjective) costing nothing | Synonyms: complimentary, costless, free, gratis |
| gregarious | (adjective) (of animals) tending to form a group with others of the same species | - |
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| (adjective) (of plants) growing in groups that are close together | - |
| (adjective) instinctively or temperamentally seeking and enjoying the company of others | - |
| grievous | (adjective) causing fear or anxiety by threatening great harm | Synonyms: dangerous, grave, life-threatening, serious, severe |
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| (adjective) shockingly brutal or cruel | Synonyms: atrocious, flagitious, monstrous |
| (adjective) of great gravity or crucial import; requiring serious thought | Synonyms: grave, heavy, weighty |
| (adjective) causing or marked by grief or anguish | Synonyms: heartbreaking, heartrending |
| grumous | (adjective) transformed from a liquid into a soft semisolid or solid mass | Synonyms: coagulate, coagulated, curdled, grumose |
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| gumptious | (adjective) working hard to promote an enterprise | Synonyms: energetic, industrious, up-and-coming |
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| gymnospermous | (adjective) relating to or characteristic of plants of the class Gymnospermae | - |
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| gynandromorphous | (adjective) having both male and female morphological characteristics | Synonyms: gynandromorphic |
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| harmonious | (adjective) musically pleasing | - |
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| (adjective) exhibiting equivalence or correspondence among constituents of an entity or between different entities | Synonyms: proportionate, symmetrical |
| (adjective) existing together in harmony | - |
| (adjective) suitable and fitting | - |
| hazardous | (adjective) involving risk or danger | Synonyms: risky, wild |
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| heinous | (adjective) extremely wicked, deeply criminal | Synonyms: flagitious |
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| hemimetabolous | (adjective) (of an insect with aquatic young) undergoing incomplete metamorphosis in which the young does not resemble the adult | Synonyms: hemimetabolic, hemimetamorphic, hemimetamorphous |
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| hemimetamorphous | (adjective) (of an insect with aquatic young) undergoing incomplete metamorphosis in which the young does not resemble the adult | Synonyms: hemimetabolic, hemimetabolous, hemimetamorphic |
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| herbaceous | (adjective) characteristic of a nonwoody herb or plant part | - |
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| herbivorous | (adjective) feeding only on plants | - |
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| heteroecious | (adjective) of parasites; passing through different stages of the life cycle on different host species | - |
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| heterogeneous | (adjective) consisting of elements that are not of the same kind or nature | Synonyms: heterogenous |
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| (adjective) originating outside the body | Synonyms: heterogenous |
| heterogenous | (adjective) originating outside the body | Synonyms: heterogeneous |
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| (adjective) consisting of elements that are not of the same kind or nature | Synonyms: heterogeneous |
| heteroicous | (adjective) having several forms of gametoecia on the same plant | Synonyms: polygamous, polyoicous |
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| heterologous | (adjective) derived from organisms of a different but related species | - |
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| (adjective) not corresponding in structure or evolutionary origin | Synonyms: heterologic, heterological |
| heterometabolous | (adjective) (of an insect) undergoing incomplete metamorphosis in which the nymph is essentially like the adult and there is no pupal stage | Synonyms: heterometabolic |
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| heterosporous | (adjective) characterized by heterospory | - |
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| heterozygous | (adjective) having dissimilar alleles at corresponding chromosomal loci | - |
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| hideous | (adjective) grossly offensive to decency or morality; causing horror | Synonyms: horrid, horrific, outrageous |
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| (adjective) so extremely ugly as to be terrifying | Synonyms: repulsive |
| hilarious | (adjective) marked by or causing boisterous merriment or convulsive laughter | Synonyms: screaming, uproarious |
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| holometabolous | (adjective) (of an insect) undergoing complete metamorphosis | Synonyms: holometabolic |
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| homoecious | (adjective) of parasites especially rust fungi; completing the entire life cycle on a single host | Synonyms: autoecious |
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| homogeneous | (adjective) all of the same or similar kind or nature | Synonyms: homogenous |
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| homogenous | (adjective) all of the same or similar kind or nature | Synonyms: homogeneous |
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| homologous | (adjective) corresponding or similar in position or structure or function or characteristics; especially derived from an organism of the same species | - |
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| (adjective) having the same evolutionary origin but not necessarily the same function | - |
| homonymous | (adjective) of or related to or being homonyms | Synonyms: homonymic |
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| homophonous | (adjective) characteristic of the phenomenon of words of different origins that are pronounced the same way | - |
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| homosporous | (adjective) characterized by homospory | - |
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| homostylous | (adjective) (botany) having styles all of the same length | Synonyms: homostyled, homostylic |
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| homozygous | (adjective) having identical alleles at corresponding chromosomal loci | - |
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| horrendous | (adjective) causing fear or dread or terror | Synonyms: awful, dire, direful, dread, dreaded, dreadful, fearful, fearsome, frightening, horrific, terrible |
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| humongous | (adjective) (used informally) very large | Synonyms: banging, thumping, walloping, whopping |
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| humorous | (adjective) full of or characterized by humor | Synonyms: humourous |
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| humourous | (adjective) full of or characterized by humor | Synonyms: humorous |
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| hydrous | (adjective) containing combined water (especially water of crystallization as in a hydrate) | Synonyms: hydrated |
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| hymenopterous | (adjective) of or relating to insects of the order Hymenoptera | - |
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| hypognathous | (adjective) having a projecting lower jaw | Synonyms: prognathic, prognathous |
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| ichorous | (adjective) of or resembling or characterized by ichor or sanies | Synonyms: sanious |
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| idolatrous | (adjective) relating to or practicing idolatry | - |
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| (adjective) blindly or excessively devoted or adoring | - |
| igneous | (adjective) produced by the action of fire or intense heat | Synonyms: eruptive |
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| (adjective) produced under conditions involving intense heat | Synonyms: pyrogenic, pyrogenous |
| (adjective) like or suggestive of fire | Synonyms: fiery |
| ignominious | (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: black, disgraceful, inglorious, opprobrious, shameful |
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| illustrious | (adjective) having or conferring glory | - |
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| (adjective) widely known and esteemed | Synonyms: celebrated, famed, famous, far-famed, notable, noted, renowned |
| impecunious | (adjective) not having enough money to pay for necessities | Synonyms: hard up, in straitened circumstances, penniless, penurious, pinched |
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| imperious | (adjective) having or showing arrogant superiority to and disdain of those one views as unworthy | Synonyms: disdainful, haughty, lordly, overbearing, prideful, sniffy, supercilious, swaggering |
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| impervious | (adjective) not admitting of passage or capable of being affected | Synonyms: imperviable |
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| impetiginous | (adjective) of or relating to or having impetigo | - |
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| impetuous | (adjective) marked by violent force | - |
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| (adjective) characterized by undue haste and lack of thought or deliberation | Synonyms: brainish, hotheaded, impulsive, madcap, tearaway |
| impious | (adjective) lacking piety or reverence for a god | - |
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| (adjective) lacking due respect or dutifulness | Synonyms: undutiful |
| 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 |
| incautious | (adjective) lacking in caution | - |
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| (adjective) carelessly failing to exercise proper caution | - |
| incestuous | (adjective) relating to or involving incest | - |
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| (adjective) resembling incest as by excessive intimacy | - |
| incommodious | (adjective) uncomfortably or inconveniently small | - |
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| incongruous | (adjective) lacking in harmony or compatibility or appropriateness | - |
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| inconspicuous | (adjective) not prominent or readily noticeable | Synonyms: invisible |
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| incredulous | (adjective) not disposed or willing to believe; unbelieving | - |
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| incurious | (adjective) showing absence of intellectual inquisitiveness or natural curiosity | - |
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| indecorous | (adjective) lacking propriety and good taste in manners and conduct | Synonyms: indelicate |
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| (adjective) not in keeping with accepted standards of what is right or proper in polite society | Synonyms: indecent, unbecoming, uncomely, unseemly, untoward |
| indigenous | (adjective) originating where it is found | Synonyms: autochthonal, autochthonic, autochthonous, endemic |
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| industrious | (adjective) characterized by hard work and perseverance | Synonyms: hardworking, tireless, untiring |
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| (adjective) working hard to promote an enterprise | Synonyms: energetic, gumptious, up-and-coming |
| inefficacious | (adjective) lacking the power to produce a desired effect | - |
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| infamous | (adjective) known widely and usually unfavorably | Synonyms: ill-famed, notorious |
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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 |
| infelicitous | (adjective) not appropriate in application; defective | - |
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| (adjective) marked by or producing unhappiness | Synonyms: unhappy |
| ingenious | (adjective) showing inventiveness and skill | Synonyms: clever, cunning |
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| ingenuous | (adjective) characterized by an inability to mask your feelings; not devious | Synonyms: artless |
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| (adjective) lacking in sophistication or worldliness | Synonyms: innocent |
| inglorious | (adjective) not bringing honor and glory | - |
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| (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: black, disgraceful, ignominious, opprobrious, shameful |
| inharmonious | (adjective) not in harmony | Synonyms: unharmonious |
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| (adjective) lacking in harmony of parts | - |
| inhomogeneous | (adjective) not homogeneous | Synonyms: nonuniform |
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| iniquitous | (adjective) characterized by iniquity; wicked because it is believed to be a sin | Synonyms: sinful, ungodly |
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| injudicious | (adjective) lacking or showing lack of judgment or discretion; unwise | - |
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| injurious | (adjective) harmful to living things | Synonyms: deleterious, hurtful |
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| innocuous | (adjective) not injurious to physical or mental health | - |
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| (adjective) lacking intent or capacity to injure | Synonyms: innocent |
| (adjective) not causing disapproval | Synonyms: unobjectionable |
| innoxious | (adjective) having no adverse effect | - |
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| innumerous | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable |
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| inodorous | (adjective) having no odor | Synonyms: odorless, odourless |
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| insalubrious | (adjective) detrimental to health | Synonyms: unhealthful, unhealthy |
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| insectivorous | (adjective) (of animals and plants) feeding on insects | - |
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| insidious | (adjective) intended to entrap | - |
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| (adjective) working or spreading in a hidden and usually injurious way | Synonyms: pernicious, subtle |
| (adjective) beguiling but harmful | - |
| instantaneous | (adjective) occurring with no delay | Synonyms: instant |
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| intracutaneous | (adjective) relating to areas between the layers of the skin | Synonyms: intradermal, intradermic |
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| intravenous | (adjective) within or by means of a vein | Synonyms: endovenous |
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| invidious | (adjective) containing or implying a slight or showing prejudice | Synonyms: discriminatory |
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| iridaceous | (adjective) of or pertaining to or characteristic of plants of the family Iridaceae | - |
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| irreligious | (adjective) hostile or indifferent to religion | - |
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| isochronous | (adjective) equal in duration or interval | Synonyms: isochronal |
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| isomorphous | (adjective) having similar appearance but genetically different | Synonyms: isomorphic |
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| isotropous | (adjective) invariant with respect to direction | Synonyms: isotropic |
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| jealous | (adjective) showing extreme cupidity; painfully desirous of another's advantages | Synonyms: covetous, envious |
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| (adjective) suspicious or unduly suspicious or fearful of being displaced by a rival | Synonyms: green-eyed, overjealous |
| joyous | (adjective) full of or characterized by joy | - |
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| judicious | (adjective) marked by the exercise of good judgment or common sense in practical matters | Synonyms: heady, wise |
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| jumentous | (adjective) smelling strongly like a beast of burden | - |
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| laborious | (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: arduous, backbreaking, grueling, gruelling, hard, heavy, operose, punishing, toilsome |
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| languorous | (adjective) lacking spirit or liveliness | Synonyms: dreamy, lackadaisical, languid |
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| lascivious | (adjective) driven by lust; preoccupied with or exhibiting lustful desires | Synonyms: lewd, libidinous, lustful |
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