smoldered

verb
  1. 1

    To burn with no flame and little smoke.

  2. 2

    To show signs of repressed anger or suppressed mental turmoil or other strong emotion, such as passion.

  3. 3

    To exist in a suppressed or hidden state.

Source: https://en.wiktionary.org/wiki/smolder, https://en.wiktionary.org/wiki/smoldered