The Italian term "nitido, acuto, stridulo, elevato" matches the English term "sharp"

other italian words that include "nitido" : english :
nitido, intensivo acute
nitido, erosivo caustic
ansioso, nitido keen
other italian words that include "acuto" : english :
acuto, escoriare abrasive
acuto lurid
other italian words that include "stridulo" : english :
elevato, stridulo shrill