| insane | (adjective) afflicted with or characteristic of mental derangement | - |
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| (adjective) very foolish | Synonyms: harebrained, mad |
| insanely | (adverb) in an insane manner | Synonyms: crazily, dementedly, madly |
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| (adverb) (used as intensives) excessively | Synonyms: deadly, deucedly, devilishly, madly |
| insaneness | (noun) obsolete terms for legal insanity | Synonyms: lunacy, madness |
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| isanemone | (noun) an isogram connecting points having equal wind speed. | - |
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| sane | (adjective) mentally healthy; free from mental disorder | - |
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| (adjective) marked by sound judgment; having good reason | Synonyms: reasonable |
| sanely | (adverb) with good sense or in a reasonable or intelligent manner | Synonyms: reasonably, sensibly |
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| (adverb) in a sane or lucid manner | - |
| saneness | (noun) normal or sound powers of mind | Synonyms: sanity |
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| tisane | (noun) infusion of e.g. dried or fresh flowers or leaves | - |
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