Razor-sharp is an adjective used to describe something that is extremely sharp or precise. It can be used to describe a blade, a mind, or a wit. The two crossword solutions for this term are 'KEEN' and 'ACUTE'. 'KEEN' is an adjective meaning having a fine edge or point, and 'ACUTE' is an adjective meaning having a sharpness or intensity of perception, feeling, or intellect. Both words accurately describe the term razor-sharp.