IPA: /ˈvɛəriəblnəs/
KK: /ˈvɛrɪəblnəs/
The quality or condition of being changeable or not constant.
The variableness of the weather makes it hard to plan outdoor activities.
Variableness → It is formed from "variabilis" (from Latin, meaning changeable) and the suffix "-ness" (meaning the state or quality of). The word "variableness" refers to the quality of being changeable or capable of variation.
Think of 'changeable' ('variabilis') to remember that 'variableness' means the quality of being changeable.