IPA: /dɪˈmændɪŋnəs/
KK: /dɪˈmændɪŋnəs/
The quality of requiring a lot of effort, attention, or skill.
Her demandingness as a coach pushed the team to improve their performance.
Demandingness → It is formed from "demand" (from Old French *demander*, meaning to ask or request) and the suffix "-ing" (indicating the action or process) and "-ness" (indicating a state or quality). The word "demandingness" refers to the quality or state of being demanding or requiring a lot from others.
Think of the act of 'asking' or 'requesting' ('demand') and how that action can create a state of requiring much from someone, which is what 'demandingness' means.