| addlebrained | (adjective) stupid and confused | Synonyms: addlepated, muddleheaded, puddingheaded |
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| brainish | (adjective) characterized by undue haste and lack of thought or deliberation | Synonyms: hotheaded, impetuous, impulsive, madcap, tearaway |
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| brainless | (adjective) not using intelligence | Synonyms: headless |
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| brainsick | (adjective) affected with madness or insanity | Synonyms: crazy, demented, disturbed, mad, sick, unbalanced, unhinged |
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| brainwashed | (adjective) subjected to intensive forced indoctrination resulting in the rejection of old beliefs and acceptance of new ones | - |
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| brainy | (adjective) having or marked by unusual and impressive intelligence | Synonyms: brilliant, smart as a whip |
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| constrained | (adjective) lacking spontaneity; not natural | Synonyms: forced, strained |
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| constraining | (adjective) restricting the scope or freedom of action | Synonyms: confining, constrictive, limiting, restricting |
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| crackbrained | (adjective) insanely irresponsible | Synonyms: idiotic |
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| drained | (adjective) emptied or exhausted of (as by drawing off e.g. water or other liquid) | - |
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| (adjective) extremely exhausted | Synonyms: knackered |
| (adjective) drained of electric charge; discharged | Synonyms: dead |
| draining | (adjective) having a debilitating effect | Synonyms: exhausting |
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| featherbrained | (adjective) lacking seriousness; given to frivolity | Synonyms: airheaded, dizzy, empty-headed, giddy, light-headed, lightheaded, silly |
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| grainy | (adjective) composed of or covered with particles resembling meal in texture or consistency | Synonyms: coarse-grained, farinaceous, granular, granulose, gritty, mealy |
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| harebrained | (adjective) very foolish | Synonyms: insane, mad |
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| ingrained | (adjective) (used especially of ideas or principles) deeply rooted; firmly fixed or held | Synonyms: deep-rooted, deep-seated, implanted, planted |
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| raining | (adjective) falling in drops or as if falling like rain | - |
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| rainless | (adjective) lacking rain | - |
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| rainproof | (adjective) not permitting the passage of water | Synonyms: waterproof, waterproofed |
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| rainy | (adjective) (of weather) wet by periods of rain | Synonyms: showery |
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| rattlebrained | (adjective) lacking sense or discretion | Synonyms: rattlepated, scatterbrained, scatty |
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| restrained | (adjective) under restraint | - |
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| (adjective) prudent | Synonyms: guarded |
| (adjective) marked by avoidance of extravagance or extremes | Synonyms: moderate |
| (adjective) cool and formal in manner | Synonyms: reticent, unemotional |
| (adjective) not showy or obtrusive | Synonyms: quiet |
| scatterbrained | (adjective) lacking sense or discretion | Synonyms: rattlebrained, rattlepated, scatty |
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| (adjective) guided by whim and fancy | Synonyms: flighty, flyaway, head-in-the-clouds |
| strained | (adjective) struggling for effect | Synonyms: agonistic |
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| (adjective) lacking natural ease | Synonyms: labored, laboured |
| (adjective) showing signs of mental and emotional tension | - |
| (adjective) lacking spontaneity; not natural | Synonyms: constrained, forced |
| straining | (adjective) taxing to the utmost; testing powers of endurance | Synonyms: arduous, strenuous |
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| trained | (adjective) shaped or conditioned or disciplined by training; often used as a combining form | - |
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| unbrainwashed | (adjective) not successfully subjected to brainwashing | - |
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| unconstrained | (adjective) free from constraint | - |
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| undrained | (adjective) not drained | - |
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| unrestrained | (adjective) not subject to restraint | - |
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| (adjective) marked by uncontrolled excitement or emotion | Synonyms: delirious, excited, frantic, mad |
| unstrained | (adjective) not resulting from undue effort; not forced | Synonyms: unforced |
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| (adjective) not placed under psychological stress | - |
| untrained | (adjective) not disciplined or conditioned or made adept by training | - |
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