| anticholinergic | (adjective) inhibiting or blocking the action of acetylcholine at a receptor site | - |
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| cholinergic | (adjective) releasing or activated by acetylcholine or a related compound | - |
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| cinerary | (adjective) containing or used for ashes of the cremated dead | - |
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| finer | (adjective) (comparative of `fine') greater in quality or excellence | - |
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| ineradicable | (adjective) not able to be destroyed or rooted out | - |
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| inerrable | (adjective) not liable to error | Synonyms: inerrant, unerring |
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| inerrant | (adjective) not liable to error | Synonyms: inerrable, unerring |
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| inert | (adjective) slow and apathetic | Synonyms: sluggish, soggy, torpid |
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| (adjective) unable to move or resist motion | - |
| (adjective) having only a limited ability to react chemically; chemically inactive | Synonyms: indifferent, neutral |
| inertial | (adjective) of or relating to inertia | - |
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| itinerant | (adjective) traveling from place to place to work | - |
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| mineral | (adjective) relating to minerals | - |
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| (adjective) composed of matter other than plant or animal | - |