Antonyms for the term "more undemanding" include words such as "challenging," "difficult," "demanding," "exact," "precise," and "tough." These words convey the opposite meaning of "more undemanding" which implies that the task at hand is relatively easy or simple. When faced with a challenging task, one needs to put in extra effort, concentration, and focus. This is quite different from the situation when the work is undemanding, where one can complete it without much hassle. Therefore, using antonyms can help express different shades of meaning, and communicate more effectively.