IPA: /ˌbɛnɪˈfɪʃənləs/
KK: /bɛnɪˈfɪʃənləs/
The quality or state of being helpful or good for someone or something.
The beneficialness of regular exercise is well-documented.
Beneficialness → It is formed from "beneficial" (from Latin "beneficium", meaning a good deed or benefit) and the suffix "-ness" (meaning the state or quality of). The word "beneficialness" refers to the quality of being beneficial or advantageous.
Think of 'beneficial' as something that brings 'good' ('bene') and remember that '-ness' indicates a state or quality. So, beneficialness is the state of being good or advantageous.