yammering

/Y AE1 M ER0 IH0 NG/
verb
  1. 1

    To complain peevishly.

  2. 2

    To talk loudly and persistently.

  3. 3

    To repeat on and on, usually loudly or in complaint.

  4. 4

    To make an outcry; to clamor.

noun
  1. 1

    Loud, incoherent, repetitive speech.

Source: https://en.wiktionary.org/wiki/yammer, https://en.wiktionary.org/wiki/yammering