| hydrodynamic | (adjective) of or relating to hydrodynamics | - |
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| hydroelectric | (adjective) of or relating to or used in the production of electricity by waterpower | - |
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| hydrographic | (adjective) of or relating to the science of hydrography | Synonyms: hydrographical |
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| hydrographical | (adjective) of or relating to the science of hydrography | Synonyms: hydrographic |
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| hydrokinetic | (adjective) relating to fluids in motion or the forces that produce or affect such motion | - |
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| hydrolyzable | (adjective) capable of undergoing hydrolysis | - |
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| hydrometric | (adjective) of or relating to hydrometry | Synonyms: gravimetric |
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| hydropathic | (adjective) of or relating to hydropathy or its administration | - |
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| hydrophilic | (adjective) having a strong affinity for water; tending to dissolve in, mix with, or be wetted by water | - |
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| hydrophobic | (adjective) lacking affinity for water; tending to repel and not absorb water; tending not to dissolve in or mix with or be wetted by water | - |
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| (adjective) abnormally afraid of water | Synonyms: aquaphobic |
| hydrophytic | (adjective) growing wholly or partially in water | - |
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| hydroponic | (adjective) of or relating to aquiculture | Synonyms: aquacultural, aquicultural |
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| hydrostatic | (adjective) relating to fluids at rest or to the pressures they exert or transmit | - |
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| hydrous | (adjective) containing combined water (especially water of crystallization as in a hydrate) | Synonyms: hydrated |
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| hydroxy | (adjective) being or containing a hydroxyl group | - |
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| hypochondriac | (adjective) suffering from hypochondria | Synonyms: hypochondriacal |
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| hypochondriacal | (adjective) suffering from hypochondria | Synonyms: hypochondriac |
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| icosahedral | (adjective) of or relating to an icosahedron | - |
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| indrawn | (adjective) tending to reserve or introspection | Synonyms: withdrawn |
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| kindred | (adjective) related by blood or marriage | - |
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| (adjective) similar in quality or character | Synonyms: akin |
| maladroit | (adjective) not adroit | - |
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| melodramatic | (adjective) characteristic of acting or a stage performance; often affected | Synonyms: histrionic |
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| (adjective) having the excitement and emotional appeal of melodrama | - |
| monandrous | (adjective) having only one husband at a time | - |
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| overdressed | (adjective) dressed too elaborately | - |
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| polyandrous | (adjective) having more than one husband at a time | - |
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| polyhedral | (adjective) of or relating to or resembling a polyhedron | - |
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| prodromal | (adjective) symptomatic of the onset of an attack or a disease | Synonyms: prodromic |
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| prodromic | (adjective) symptomatic of the onset of an attack or a disease | Synonyms: prodromal |
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| quadrangular | (adjective) of or relating to or shaped like a quadrangle | - |
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| quadraphonic | (adjective) of or relating to quadraphony | Synonyms: quadrasonic, quadriphonic, quadrisonic |
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| quadrasonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadriphonic, quadrisonic |
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| quadrate | (adjective) having four sides and four angles | - |
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| quadratic | (adjective) involving the second and no higher power of a quantity or degree | - |
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| quadrilateral | (adjective) having four sides | Synonyms: four-sided |
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| quadrillionth | (adjective) the ordinal number of one quadrillion in counting order | - |
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| quadripartite | (adjective) involving four parties | Synonyms: four-party |
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| quadriphonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadrasonic, quadrisonic |
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| quadrisonic | (adjective) of or relating to quadraphony | Synonyms: quadraphonic, quadrasonic, quadriphonic |
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| quadruped | (adjective) having four feet | Synonyms: four-footed, quadrupedal |
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| quadrupedal | (adjective) having four feet | Synonyms: four-footed, quadruped |
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| quadruple | (adjective) four times as great or many | Synonyms: four-fold, fourfold |
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| (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruplex, quadruplicate |
| quadruplex | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplicate |
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| quadruplicate | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplex |
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| rhombohedral | (adjective) having threefold symmetry | Synonyms: trigonal |
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| roughdried | (adjective) (of laundry) dried but not ironed | - |
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| salamandriform | (adjective) shaped like a salamander | - |
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| scoundrelly | (adjective) lacking principles or scruples | Synonyms: blackguardly, rascally, roguish |
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| sundried | (adjective) dried naturally by the sun | Synonyms: sun-dried |
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| sundry | (adjective) consisting of a haphazard assortment of different kinds | Synonyms: assorted, miscellaneous, mixed, motley |
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| tawdry | (adjective) made of inferior workmanship and materials | Synonyms: cheapjack, shoddy |
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| (adjective) tastelessly showy | Synonyms: brassy, cheap, flash, flashy, garish, gaudy, gimcrack, loud, meretricious, tacky, tatty, trashy |
| thermohydrometric | (adjective) of or relating to thermal hydrometry | Synonyms: thermogravimetric |
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| trihydroxy | (adjective) containing three hydroxyl groups | - |
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| unaddressed | (adjective) not addressed | - |
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| underdressed | (adjective) inadequately or too informally clothed | - |
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| undrained | (adjective) not drained | - |
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| undramatic | (adjective) lacking dramatic force and quality | - |
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| undraped | (adjective) lacking drapery or draperies | - |
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| (adjective) stripped of drapery | - |
| undrawn | (adjective) not represented in a drawing | - |
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| undreamed | (adjective) not imagined even in a dream | Synonyms: undreamed of, undreamt, undreamt of, unimagined |
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| undreamt | (adjective) not imagined even in a dream | Synonyms: undreamed, undreamed of, undreamt of, unimagined |
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| undressed | (adjective) having removed clothing | Synonyms: unappareled, unattired, unclad, ungarbed, ungarmented |
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| (adjective) of lumber or stone or hides; not finished or dressed | - |
| undried | (adjective) still wet or moist | - |
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| undrinkable | (adjective) unsuitable for drinking | - |
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| withdrawn | (adjective) tending to reserve or introspection | Synonyms: indrawn |
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| (adjective) withdrawn from society; seeking solitude | Synonyms: recluse, reclusive |
| wondrous | (adjective) extraordinarily good or great; used especially as intensifiers | Synonyms: fantastic, grand, howling, marvellous, marvelous, phenomenal, rattling, terrific, tremendous, wonderful |
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