IPA: /ˈnaɪsəti/
KK: /ˈnaɪsɪti/
A small detail or fine point that is often important in a particular situation, especially in manners or etiquette.
She paid attention to the niceties of conversation to make a good impression.
Nicety → It originates from the Old French word *nicete*, meaning foolishness or ignorance, which is derived from the Latin *nicetas*, meaning foolish or silly. The word has evolved to refer to a subtlety or fine detail, often in manners or social behavior.
Think of the original meaning of foolishness or silliness to remember that 'nicety' refers to a fine detail or subtlety in manners.