laboriosissimo

== Italian == === Etymology === From laborioso +‎ -issimo. === Adjective === laboriosissimo (feminine laboriosissima, masculine plural laboriosissimi, feminine plural laboriosissime) superlative degree of laborioso very laborious very industrious or hard-working == Latin == === Adjective === labōriōsissimō dative/ablative masculine/neuter singular of labōriōsissimus