pianissimo
🇺🇸
/ˌpiːəˈnɪsɪməʊ/
🇬🇧
/ˌpiːəˈnɪsɪməʊ/
in a very quiet manner
The pianist played the melody pianissimo, barely audible to the audience.
performed very quietly
The orchestra played the nocturne with a pianissimo that was almost inaudible.