acuteness

plural acutenesses

1. uncountableusuallyThe quality of being acute or pointed.

   the acuteness of an angle

2. uncountableusuallyOf the senses or feelings: the faculty of precise discernment or perception; sensitiveness.

   By acuteness of intellect, we discern nice distinctions.

   1 more example

   By acuteness of feeling, we perceive small objects or slight impressions.

3. uncountableusuallyOf sounds: shrillness; high pitch.
4. uncountableusuallymedicineViolence of a disease, which brings it speedily to a crisis.

   At the time, I set it down to some idiosyncratic, personal distaste, and merely wondered at the acuteness of the symptoms; but I have since had reason to believe the cause to lie much deeper in the nature of man, and to turn on some nobler hinge than the principle of hatred.

   1886 January 5, Robert Louis Stevenson, “Dr. Lanyon’s Narrative”, in Strange Case of Dr Jekyll and Mr Hyde, London: Longmans, Green, and Co., →OCLC, page 99

5. uncountableusuallyShrewdness, quickness of mind.