IPA: /dɪˈmændɪŋ/
KK: /dɪˈmændɪŋ/
Requiring a lot of effort, time, or attention to complete or manage.
Her demanding schedule left her with little free time.
Demanding → It is formed from "demand" (from Old French *demander*, meaning to ask or request) and "-ing" (a suffix used to form present participles or adjectives). The word "demanding" describes something that requires a lot of effort or attention, as it is asking for more than usual.
Think of something that is 'asking' ('demander') for a lot of effort or attention — that's why we say it is demanding.