IPA: /ˈwɪnɪnəs/
KK: /ˈhwɪnɪnəs/
The condition of complaining or expressing dissatisfaction in a high-pitched or annoying way.
Her constant whininess made it hard for her friends to enjoy the trip.
Whininess → It is formed from "whine" (of uncertain origin, possibly imitative of the sound) and "-ness" (meaning the state or quality of). The word "whininess" refers to the state of being whiny or complaining in a feeble or annoying manner.
Think of the sound of someone 'whining' — that's why 'whininess' means the quality of being whiny.