De·mand v. t. [imp. & p. p. Demanded; p. pr. & vb. n. Demanding.]
1. To ask or call for with authority; to claim or seek from, as by authority or right; to claim, as something due; to call for urgently or peremptorily; as, to demand a debt; to demand obedience.
This, in our foresaid holy father's name,
Pope Innocent, I do demand of thee. --Shak.
2. To inquire authoritatively or earnestly; to ask, esp. in a peremptory manner; to question.
I did demand what news from Shrewsbury. --Shak.
3. To require as necessary or useful; to be in urgent need of; hence, to call for; as, the case demands care.
4. Law To call into court; to summon.
adj : requiring more than usually expected or thought due;
especially great patience and effort and skill; "found
the job very demanding"; "a baby can be so demanding"