1. 费时的;费力的;劳神的;要求很高的
A demanding job or task requires a lot of your time, energy, or attention.

2. 难伺候的;难取悦的;挑剔的;苛刻的
People who are demanding are not easily satisfied or pleased.

1. requiring more than usually expected or thought due
especially great patience and effort and skill

e.g. found the job very demanding
a baby can be so demanding