| frustrating | (adjective) discouraging by hindering | - |
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| (adjective) preventing realization or attainment of a desire | Synonyms: frustrative, thwarting |
| frustrative | (adjective) preventing realization or attainment of a desire | Synonyms: frustrating, thwarting |
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| gastric | (adjective) relating to or involving the stomach | Synonyms: stomachal, stomachic |
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| gastroduodenal | (adjective) of or relating to the stomach and the duodenum | - |
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| gastroesophageal | (adjective) of or relating to or involving the stomach and esophagus | - |
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| gastrointestinal | (adjective) of or relating to the stomach and intestines | Synonyms: GI |
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| gastronomic | (adjective) of or relating to gastronomy | Synonyms: gastronomical |
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| gastronomical | (adjective) of or relating to gastronomy | Synonyms: gastronomic |
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| geocentric | (adjective) having the earth as the center | - |
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| geometric | (adjective) of or relating to or determined by geometry | Synonyms: geometrical |
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| (adjective) characterized by simple geometric forms in design and decoration | Synonyms: geometrical |
| geometrical | (adjective) of or relating to or determined by geometry | Synonyms: geometric |
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| (adjective) characterized by simple geometric forms in design and decoration | Synonyms: geometric |
| geostrategic | (adjective) of or relating to geostrategy | - |
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| geriatric | (adjective) of or relating to or practicing geriatrics | Synonyms: gerontological |
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| (adjective) of or relating to the aged | - |
| gonadotrophic | (adjective) of or relating to or involving gonadotropin | Synonyms: gonadotropic |
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| gonadotropic | (adjective) of or relating to or involving gonadotropin | Synonyms: gonadotrophic |
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| gravimetric | (adjective) of or relating to hydrometry | Synonyms: hydrometric |
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| headstrong | (adjective) habitually disposed to disobedience and opposition | Synonyms: froward, self-willed, wilful, willful |
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| heartrending | (adjective) causing or marked by grief or anguish | Synonyms: grievous, heartbreaking |
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| heliocentric | (adjective) having the sun as the center | - |
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| heterotrophic | (adjective) requiring organic compounds of carbon and nitrogen for nourishment | - |
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| histrionic | (adjective) characteristic of acting or a stage performance; often affected | Synonyms: melodramatic |
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| homocentric | (adjective) having a common center | Synonyms: concentric, concentrical |
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| hydroelectric | (adjective) of or relating to or used in the production of electricity by waterpower | - |
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| hydrometric | (adjective) of or relating to hydrometry | Synonyms: gravimetric |
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| hypermetropic | (adjective) abnormal ability to focus of distant objects | Synonyms: hyperopic |
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| hypertrophied | (adjective) (of an organ or body part) excessively enlarged as a result of increased size in the constituent cells | Synonyms: enlarged |
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| iatrogenic | (adjective) induced by a physician's words or therapy (used especially of a complication resulting from treatment) | - |
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| idolatrous | (adjective) relating to or practicing idolatry | - |
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| (adjective) blindly or excessively devoted or adoring | - |
| illustrative | (adjective) clarifying by use of examples | Synonyms: exemplifying |
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| (adjective) serving to demonstrate | Synonyms: demonstrative |
| illustrious | (adjective) having or conferring glory | - |
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| (adjective) widely known and esteemed | Synonyms: celebrated, famed, famous, far-famed, notable, noted, renowned |
| 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 |
| imputrescible | (adjective) not subject to decay | - |
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| incontrovertible | (adjective) necessarily or demonstrably true | Synonyms: demonstrable |
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| (adjective) impossible to deny or disprove | Synonyms: irrefutable, positive |
| indestructible | (adjective) not easily destroyed | - |
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| (adjective) very long lasting | Synonyms: durable, perdurable, undestroyable |
| industrial | (adjective) having highly developed industries | - |
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| (adjective) of or relating to or resulting from industry | - |
| (adjective) employed in industry | - |
| (adjective) suitable to stand up to hard wear | - |
| industrialised | (adjective) made industrial; converted to industrialism | Synonyms: industrialized |
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| industrialized | (adjective) made industrial; converted to industrialism | Synonyms: industrialised |
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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 |
| inextricable | (adjective) not permitting extrication; incapable of being disentangled or untied | - |
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| instructional | (adjective) of or relating to or used in instruction | - |
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| instructive | (adjective) serving to instruct or enlighten or inform | Synonyms: informative |
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| instrumental | (adjective) relating to or designed for or performed on musical instruments | - |
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| (adjective) serving or acting as a means or aid | Synonyms: implemental, subservient |
| intertribal | (adjective) between or among tribes | - |
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| intracellular | (adjective) located or occurring within a cell or cells | - |
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| intracerebral | (adjective) within the brain | - |
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| intracranial | (adjective) within the skull | - |
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| intractable | (adjective) not tractable; difficult to manage or mold | - |
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| intracutaneous | (adjective) relating to areas between the layers of the skin | Synonyms: intradermal, intradermic |
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| intradepartmental | (adjective) within a department | - |
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| intradermal | (adjective) relating to areas between the layers of the skin | Synonyms: intracutaneous, intradermic |
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| intradermic | (adjective) relating to areas between the layers of the skin | Synonyms: intracutaneous, intradermal |
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| intragroup | (adjective) occurring within an institution or community | Synonyms: internal |
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| intralinguistic | (adjective) within a particular language | - |
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| intralobular | (adjective) inside lobes or lobules | - |
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| intramolecular | (adjective) within the molecule; occurring by a reaction between different parts of the same molecule | - |
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| intramural | (adjective) carried on within the bounds of an institution or community | - |
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| intramuscular | (adjective) within a muscle | - |
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| intransigent | (adjective) impervious to pleas, persuasion, requests, reason | Synonyms: adamant, adamantine, inexorable |
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| intransitive | (adjective) designating a verb that does not require or cannot take a direct object | - |
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| intrapulmonary | (adjective) being or occurring within a lung | - |
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| intrasentential | (adjective) of or relating to constituents within a sentence | - |
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| intraspecies | (adjective) arising or occurring within a species; involving the members of one species | Synonyms: intraspecific |
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| intraspecific | (adjective) arising or occurring within a species; involving the members of one species | Synonyms: intraspecies |
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| intrastate | (adjective) relating to or existing within the boundaries of a state | - |
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| intrauterine | (adjective) within the womb | - |
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| intravenous | (adjective) within or by means of a vein | Synonyms: endovenous |
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| intraventricular | (adjective) within the system of ventricles in the brain | - |
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| intrepid | (adjective) invulnerable to fear or intimidation | Synonyms: audacious, brave, dauntless, fearless, hardy, unfearing |
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| intricate | (adjective) having many complexly arranged elements; elaborate | - |
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| intriguing | (adjective) capable of arousing interest or curiosity | - |
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| (adjective) disturbingly provocative | Synonyms: challenging |
| intrinsic | (adjective) belonging to a thing by its very nature | Synonyms: intrinsical |
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| (adjective) situated within or belonging solely to the organ or body part on which it acts | - |
| intrinsical | (adjective) belonging to a thing by its very nature | Synonyms: intrinsic |
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| introductory | (adjective) serving as a base or starting point | Synonyms: basic |
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| (adjective) serving to open or begin | - |
| (adjective) serving as an introduction or preface | Synonyms: prefatorial, prefatory |
| introjected | (adjective) incorporated unconsciously into your own psyche | - |
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| introspective | (adjective) given to examining own sensory and perceptual experiences | Synonyms: introverted, self-examining |
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| introuvable | (adjective) impossible to find | - |
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| introversive | (adjective) directed inward; marked by interest in yourself or concerned with inner feelings | Synonyms: introvertive |
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| introverted | (adjective) given to examining own sensory and perceptual experiences | Synonyms: introspective, self-examining |
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| introvertish | (adjective) somewhat introverted | Synonyms: shut-in |
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| introvertive | (adjective) directed inward; marked by interest in yourself or concerned with inner feelings | Synonyms: introversive |
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| intruding | (adjective) projecting inward | - |
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| intrusive | (adjective) tending to intrude (especially upon privacy) | - |
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| (adjective) thrusting inward | - |
| (adjective) of rock material; forced while molten into cracks between layers of other rock | - |
| irretrievable | (adjective) impossible to recover or recoup or overcome | Synonyms: unretrievable |
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| isentropic | (adjective) with unchanging entropy; at constant entropy | - |
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| isometric | (adjective) of or involving muscular contraction in which tension increases while length remains constant | - |
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| (adjective) related by an isometry | - |
| (adjective) of a crystal system characterized by three equal axes at right angles | - |
| (adjective) having equal dimensions or measurements | Synonyms: isometrical |
| isometrical | (adjective) having equal dimensions or measurements | Synonyms: isometric |
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| isotropic | (adjective) invariant with respect to direction | Synonyms: isotropous |
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| isotropous | (adjective) invariant with respect to direction | Synonyms: isotropic |
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| lacklustre | (adjective) lacking luster or shine | Synonyms: lackluster, lusterless, lustreless |
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| (adjective) lacking brilliance or vitality | Synonyms: lackluster, lusterless, lustreless |
| lacustrine | (adjective) of or relating to or living near lakes | - |
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| lipotropic | (adjective) having an affinity for lipids | Synonyms: lipophilic |
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| lustreless | (adjective) lacking luster or shine | Synonyms: lackluster, lacklustre, lusterless |
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| (adjective) lacking brilliance or vitality | Synonyms: lackluster, lacklustre, lusterless |
| lustrous | (adjective) brilliant | - |
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| (adjective) made smooth and bright by or as if by rubbing; reflecting a sheen or glow | Synonyms: bright, burnished, shining, shiny |
| (adjective) reflecting light | Synonyms: glistening, glossy, sheeny, shining, shiny |
| mainstreamed | (adjective) (of the handicapped) placed in regular school classes | - |
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| maltreated | (adjective) subjected to cruel treatment | Synonyms: abused, ill-treated, mistreated |
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| matriarchal | (adjective) characteristic of a matriarchy | - |
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| matriarchic | (adjective) (of societies or families) having a female as the family head or having descent traced through the female line | - |
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| matricentric | (adjective) centered upon the mother | - |
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| matrilineal | (adjective) based on or tracing descent through the female line | Synonyms: matrilinear |
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| matrilinear | (adjective) based on or tracing descent through the female line | Synonyms: matrilineal |
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