Antonyms for the word "be pleased by" include terms that convey a range of negative emotions. These may include words such as "displeased," which means to be dissatisfied or unhappy with something, "disappointed," which implies a sense of regret or a letdown, and "angry," which denotes feelings of intense frustration or outrage. Other potential antonyms for "be pleased by" might include terms such as "frustrated," "irritated," or "miserable," each of which conveys a sense of unhappiness, dissatisfaction, or discomfort. Ultimately, the choice of the appropriate antonym will depend on the context in which the term is being used, as well as the intended emotions or reaction to the situation at hand.