| inodorous | (adjective) having no odor | Synonyms: odorless, odourless |
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| inoffensive | (adjective) giving no offense | - |
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| (adjective) not causing anger or annoyance | Synonyms: unoffending |
| inoperable | (adjective) not suitable for surgery | - |
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| (adjective) not able to perform its normal function | - |
| inoperative | (adjective) not working or taking effect | - |
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| inopportune | (adjective) not opportune | - |
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| inordinate | (adjective) beyond normal limits | Synonyms: excessive, undue, unreasonable |
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| inorganic | (adjective) relating or belonging to the class of compounds not having a carbon basis | - |
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| (adjective) lacking the properties characteristic of living organisms | - |