| austenitic | (adjective) composed of austenite | - |
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| austere | (adjective) practicing great self-denial | Synonyms: ascetic, ascetical, spartan |
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| (adjective) of a stern or strict bearing or demeanor; forbidding in aspect | Synonyms: stern |
| (adjective) severely simple | Synonyms: severe, stark, stern |
| austral | (adjective) of the south or coming from the south | - |
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| australopithecine | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| caustic | (adjective) of a substance, especially a strong acid; capable of destroying or eating away by chemical action | Synonyms: corrosive, erosive, mordant, vitriolic |
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| (adjective) harsh or corrosive in tone | Synonyms: acerb, acerbic, acid, acrid, bitter, blistering, sulfurous, sulphurous, virulent, vitriolic |
| claustrophobic | (adjective) suffering from claustrophobia; abnormally afraid of closed-in places | - |
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| (adjective) uncomfortably closed or hemmed in | - |
| exhausted | (adjective) depleted of energy, force, or strength | Synonyms: spent |
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| (adjective) drained physically | - |
| (adjective) drained of energy or effectiveness; extremely tired; completely exhausted | Synonyms: dog-tired, fagged, fatigued, gone, played out, spent, washed-out, worn-out, worn out |
| exhaustible | (adjective) capable of being used up | - |
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| (adjective) capable of being used up; capable of being exhausted | - |
| exhausting | (adjective) having a debilitating effect | Synonyms: draining |
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| (adjective) producing exhaustion | Synonyms: tiring, wearing, wearying |
| exhaustive | (adjective) performed comprehensively and completely; not superficial or partial | Synonyms: thorough, thoroughgoing |
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| inexhaustible | (adjective) incapable of being entirely consumed or used up | - |
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| (adjective) that cannot be entirely consumed or used up | Synonyms: unlimited |
| unexhausted | (adjective) not used up completely | - |
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