noun

1. A small detail or distinction.

   “We met the new captain while we were taking enemy fire and were unable to observe the niceties of formal introductions.”

2. Subtlety or precision of use.

   “A rocket-propelled grenade doesn't have the nicety of a sniper round, but you must admit its effectiveness.”

3. Delicacy of character or feeling usually from excessive refinement; fastidiousness