fortissimo fortis • fortitude · · · Info · Definitions · Synonyms · Antonyms · Characters · · fortissimo · · Text Latin · · Script 10 · · Length Definitions · · · (noun) (music) loud. Synonyms: forte. · · Noun Definition 1 (adj) chiefly a direction or description in music. · · Adjective Definition 1 (adv) a direction in music; to be played very loudly. Synonyms: very loudly. · · Adverb Definition 1 Synonyms · · · forte · · Synonym 1 very loudly · · Synonym 2 Antonyms · · · pianissimo · · Antonym 0 very softly · · Antonym 1 Characters · · f latin small letter f U+0066 i latin small letter i U+0069 m latin small letter m U+006D o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074