asperities

/AH0 S P EH1 R IH0 T IY0 Z/
noun
  1. 1

    Roughness as of stone or weather.

    โ€œthe asperity of Maine's winterโ€

  2. 2

    Harshness, as of temper.

  3. 3

    Something that is harsh and difficult to endure.

  4. 4

    A part of a geological fault line that does not move.

    โ€œEarthquakes begin and end at asperities.โ€

Source: https://en.wiktionary.org/wiki/asperities, https://en.wiktionary.org/wiki/asperity