Italian

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Etymology

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From sagace +‎ -issimo.

Adjective

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sagacissimo (feminine sagacissima, masculine plural sagacissimi, feminine plural sagacissime)

  1. superlative degree of sagace (very shrewd, very sagacious)

Latin

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Adjective

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sagācissimō

  1. dative/ablative masculine/neuter singular of sagācissimus