Italian edit

Etymology edit

From familiare +‎ -issimo.

Adjective edit

familiarissimo (feminine familiarissima, masculine plural familiarissimi, feminine plural familiarissime)

  1. superlative degree of familiare (very familiar)

Latin edit

Adjective edit

familiārissimō

  1. dative/ablative masculine/neuter singular of familiārissimus