improviso
A. -adjective
1. (=imprevisto) unexpected, unforeseen
2. ·de improviso
·unexpectedly, suddenly [dicho] off the cuff [hecho] on the spur of the moment
·coger o pillar de improviso
·to catch unawares
·hablar de improviso
·to speak off the cuff
·tocar de improviso
·to play impromptu
B. -noun masculine
·en un improviso
(Andes) * suddenly, without warning