rankling

/R AE1 NG K L IH0 NG/
verb
  1. 1

    To cause irritation or deep bitterness.

  2. 2

    To fester.

    โ€œa splinter rankles in the fleshโ€

noun
  1. 1

    A sensation that rankles.

Source: https://en.wiktionary.org/wiki/rankle, https://en.wiktionary.org/wiki/rankling