| frivolous | (adjective) not serious in content or attitude or behavior | - |
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| fruitless | (adjective) unproductive of success | Synonyms: bootless, futile, sleeveless, vain |
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| fugacious | (adjective) lasting a very short time | Synonyms: ephemeral, passing, short-lived, transient, transitory |
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| fulgurous | (adjective) amazingly impressive; suggestive of the flashing of lightning | Synonyms: dazzling, eye-popping, fulgurant |
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| fungous | (adjective) of or relating to fungi | Synonyms: fungal |
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| furious | (adjective) marked by extreme anger | Synonyms: angered, enraged, infuriated, maddened |
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| (adjective) (of the elements) as if showing violent anger | Synonyms: angry, raging, tempestuous, wild |
| (adjective) marked by extreme and violent energy | Synonyms: ferocious, fierce, savage |
| fuscous | (adjective) of something having a dusky brownish grey color | Synonyms: taupe |
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| futureless | (adjective) having no prospect or hope of a future | - |
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| gallinaceous | (adjective) of or relating to or resembling a gallinacean | - |
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| gamopetalous | (adjective) having a corolla composed of partially or wholly fused petals forming a corolla shaped like a tube or funnel | Synonyms: sympetalous |
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| gangrenous | (adjective) suffering from tissue death | Synonyms: mortified |
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| garmentless | (adjective) possessing no clothing | Synonyms: clothesless, raimentless |
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| garrulous | (adjective) full of trivial conversation | Synonyms: chatty, gabby, loquacious, talkative, talky |
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| gaseous | (adjective) existing as or having characteristics of a gas | - |
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| gaumless | (adjective) (British informal) lacking intelligence and vitality | Synonyms: gormless |
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| gelatinous | (adjective) thick like gelatin | Synonyms: gelatinlike, jellylike |
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| gemmiferous | (adjective) bearing or reproducing by a gemma | - |
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| generous | (adjective) willing to give and share unstintingly | - |
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| (adjective) not petty in character and mind | - |
| (adjective) more than is usual or necessary | - |
| geosynchronous | (adjective) of or having an orbit with a fixed period of 24 hours (although the position in the orbit may not be fixed with respect to the earth) | - |
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| gibbous | (adjective) (used of the moon) more than half full | Synonyms: gibbose |
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| (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookback, crookbacked, humpbacked, humped, hunchbacked, kyphotic |
| glabrous | (adjective) having no hair or similar growth; smooth | - |
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| glamorous | (adjective) having an air of allure, romance and excitement | Synonyms: glamourous |
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| glamourous | (adjective) having an air of allure, romance and excitement | Synonyms: glamorous |
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| glassless | (adjective) not furnished with glass | Synonyms: unglazed |
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| glaucous | (adjective) having a frosted look from a powdery coating, as on plants | - |
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| glorious | (adjective) having or deserving or conferring glory | - |
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| (adjective) having great beauty and splendor | Synonyms: resplendent, splendid, splendiferous |
| (adjective) characterized by grandeur | Synonyms: brilliant, magnificent, splendid |
| gloveless | (adjective) devoid of gloves | - |
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| glutinous | (adjective) having the sticky properties of an adhesive | Synonyms: gluey, gummy, mucilaginous, pasty, sticky, viscid, viscous |
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| gluttonous | (adjective) given to excess in consumption of especially food or drink | - |
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| goalless | (adjective) having no points scores | Synonyms: hitless, pointless, scoreless |
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| godless | (adjective) not revering god | Synonyms: irreverent |
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| gorgeous | (adjective) dazzlingly beautiful | - |
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| gormless | (adjective) (British informal) lacking intelligence and vitality | Synonyms: gaumless |
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| graceless | (adjective) lacking grace; clumsy | Synonyms: ungraceful |
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| (adjective) lacking social polish | Synonyms: gauche, unpolished |
| (adjective) lacking graciousness | - |
| gracious | (adjective) characterized by charm, good taste, and generosity of spirit | - |
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| (adjective) characterized by kindness and warm courtesy especially of a king to his subjects | Synonyms: benignant |
| (adjective) exhibiting courtesy and politeness | Synonyms: courteous, nice |
| (adjective) disposed to bestow favors | - |
| granuliferous | (adjective) producing or full of granules | - |
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| granulomatous | (adjective) relating to or characterized by granulomas | - |
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| grassless | (adjective) lacking grass | - |
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| grassroots | (adjective) fundamental | - |
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| (adjective) of or involving the common people as constituting a fundamental political and economic group | - |
| gratis | (adjective) costing nothing | Synonyms: complimentary, costless, free, gratuitous |
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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 |
| gross | (adjective) before any deductions | - |
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| (adjective) conspicuously and outrageously bad or reprehensible | Synonyms: crying, egregious, flagrant, glaring, rank |
| (adjective) repellently fat | Synonyms: porcine |
| (adjective) lacking fine distinctions or detail | - |
| (adjective) conspicuously and tastelessly indecent | Synonyms: crude, earthy, vulgar |
| (adjective) without qualification; used informally as (often pejorative) intensifiers | Synonyms: arrant, complete, consummate, double-dyed, everlasting, perfect, pure, sodding, staring, stark, thorough, thoroughgoing, unadulterated, utter |
| (adjective) visible to the naked eye (especially of rocks and anatomical features) | Synonyms: megascopic |
| groundless | (adjective) without a basis in reason or fact | Synonyms: baseless, idle, unfounded, unwarranted, wild |
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| grumous | (adjective) transformed from a liquid into a soft semisolid or solid mass | Synonyms: coagulate, coagulated, curdled, grumose |
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| guileless | (adjective) free of deceit | Synonyms: transparent |
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| guiltless | (adjective) free from evil or guilt | Synonyms: clean-handed, innocent |
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| gumptious | (adjective) working hard to promote an enterprise | Synonyms: energetic, industrious, up-and-coming |
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| gutless | (adjective) lacking courage or vitality | Synonyms: namby-pamby, spineless, wishy-washy |
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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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| hairless | (adjective) having no hair or fur | - |
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| handleless | (adjective) having no handle | - |
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| handless | (adjective) without a hand or hands | - |
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| (adjective) lacking physical movement skills, especially with the hands | Synonyms: bumbling, bungling, butterfingered, ham-fisted, ham-handed, heavy-handed, left-handed |
| hapless | (adjective) deserving or inciting pity | Synonyms: miserable, misfortunate, pathetic, piteous, pitiable, pitiful, poor, wretched |
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| harmless | (adjective) not causing or capable of causing harm | - |
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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 | - |
| hatless | (adjective) not wearing a hat | - |
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| hazardous | (adjective) involving risk or danger | Synonyms: risky, wild |
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| headless | (adjective) not having a head or formed without a head | - |
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| (adjective) not using intelligence | Synonyms: brainless |
| heartless | (adjective) lacking in feeling or pity or warmth | Synonyms: hardhearted |
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| (adjective) devoid of courage or enthusiasm | - |
| heatless | (adjective) without generating heat | - |
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| heedless | (adjective) marked by or paying little heed or attention | Synonyms: unheeding |
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| (adjective) characterized by careless unconcern | Synonyms: reckless |
| heinous | (adjective) extremely wicked, deeply criminal | Synonyms: flagitious |
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| helpless | (adjective) unable to manage independently | - |
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| (adjective) unable to function; without help | Synonyms: lost |
| (adjective) lacking in or deprived of strength or power | Synonyms: incapacitated |
| 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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| hipless | (adjective) having or seeming to have no hips | - |
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| hitless | (adjective) (of a batter) without a hit | - |
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| (adjective) having no points scores | Synonyms: goalless, pointless, scoreless |
| holometabolous | (adjective) (of an insect) undergoing complete metamorphosis | Synonyms: holometabolic |
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| homeless | (adjective) physically or spiritually homeless or deprived of security | Synonyms: dispossessed, roofless |
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| (adjective) without nationality or citizenship | Synonyms: stateless |
| 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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| hopeless | (adjective) without hope because there seems to be no possibility of comfort or success | - |
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| (adjective) (informal to emphasize how bad it is) beyond hope of management or reform | - |
| (adjective) certain to fail | - |
| (adjective) of a person unable to do something skillfully | - |
| hornless | (adjective) having no horns | - |
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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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| hueless | (adjective) of something totally lacking in saturation and therefore having no hue | - |
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| humongous | (adjective) (used informally) very large | Synonyms: banging, thumping, walloping, whopping |
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| humorless | (adjective) lacking humor | Synonyms: humourless, unhumorous |
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| humorous | (adjective) full of or characterized by humor | Synonyms: humourous |
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