IPA: /ˈkwɛr.ə.ləs.nəs/
KK: /ˈkwɛrələsnəs/
The state of being whiny or complaining often about trivial matters.
Her querulousness made it difficult for her friends to enjoy their time together.
Querulousness → It is formed from "querulus" (from Latin, meaning complaining or full of complaints) and the suffix "-ness" (meaning the state or quality of). The word "querulousness" refers to the state of being inclined to complain or express dissatisfaction.
Think of someone who is always 'complaining' ('querulus') — the '-ness' indicates a state, so querulousness means the state of being complainful.