the quality of being acute or pointed; sharpness; as, the acuteness of an angle.-the faculty of nice discernment or perception; acumen; keenness; sharpness; sensitiveness; -- applied to the senses, or the understanding. by acuteness of feeling, we perceive small objects or slight impressions: by acuteness of intellect, we discern nice distinctions.-shrillness; high pitch; -- said of sounds.-violence of a disease, which brings it speedily to a crisis.