levities

/L EH1 V IH0 T IY0 Z/
noun
  1. 1

    Lightness of manner or speech, frivolity; lack of appropriate seriousness; inclination to make a joke of serious matters.

  2. 2

    Lack of steadiness.

  3. 3

    The state or quality of being light, buoyancy.

  4. 4

    A lighthearted or frivolous act.

Antonyms

Source: https://en.wiktionary.org/wiki/levities, https://en.wiktionary.org/wiki/levity