kvetch

Noun

  1. (Yiddish) a constant complainer
  2. (Yiddish) a nagging complaint

Verb

  1. express complaints, discontent, displeasure, or unhappiness; “My mother complains all day”; “She has a lot to kick about”

From LookUp: Noun

  1. Informal North American a person who complains a great deal she emerges as something of a kvetch, constantly nagging Rick

a complaint “They don't make 'em like they used to” has become an all-purpose kvetch

Verb

  1. Informal North American complain Jane's kvetching about her crummy existence