Adverb change

Positive
fortissimo

Comparative
none

Superlative
none

 
The fortissimo sign in music
  1. (music) If something is played fortissimo it is played very loud.
    Play the opening section fortissimo instead of forte.

Noun change

Singular
fortissimo

Plural
fortissimos or fortissimi

  1. A fortissimo sign shows that a music piece should be played very loud.
    • Synonym: ff