IPA: /ˈæktɪvnəs/
KK: /ˈæktɪvnəs/
The condition of being engaged in activities or being lively and energetic.
Her activeness in the community has inspired many others to get involved.
Activeness → It is formed from "act" (from Latin "agere", meaning to do or perform) and the suffix "-ness" (meaning the state or quality of). The word "activeness" refers to the state of being active or engaged in action.
Think of 'doing' ('act') and the 'state of' ('-ness') to remember that activeness means the quality of being active.