Italian

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Etymology

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From atroce +‎ -issimo.

Adjective

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atrocissimo (feminine atrocissima, masculine plural atrocissimi, feminine plural atrocissime)

  1. superlative degree of atroce (very atrocious, very horrible)

Latin

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Adjective

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atrōcissimō

  1. dative/ablative masculine/neuter singular of atrōcissimus