louring

/L AW1 ER0 IH0 NG/
verb
  1. 1

    To frown; to look sullen.

  2. 2

    To be dark, gloomy, and threatening, as clouds; of the sky: to be covered with dark and threatening clouds; to show threatening signs of approach, as a tempest.

Synonyms

noun
  1. 1

    The act of one who, or that which, lours.

Source: https://en.wiktionary.org/wiki/lour, https://en.wiktionary.org/wiki/louring