Is “Impromptu” a Scrabble word?
Yes
IMPROMPTU
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Impromptu
/ɪmˈpɹɒmptju/
noun
1.A short musical composition for an informal occasion often with the character of improvisation and usually to be played solo.
2.(by extension) Any composition, musical or otherwise, that is created on the spot without preparation.
adjective
1.Improvised; without prior preparation, planning or rehearsal.
“The party began with an impromptu rendition of 'Happy Birthday'.”
Synonyms: extemporaneous, unplanned