When it comes to expressing disappointment or displeasure, there are a wide range of synonyms that can be used instead of "be displeased by." These include "disappointed," "dissatisfied," "unsatisfied," "irritated," "annoyed," "frustrated," "angered," "exasperated," "offended," "hurt," "upset," "distressed," "aggravated," and "disgusted," among others. Choosing the right word to convey one's feelings accurately can help avoid misunderstandings and misinterpretations. Keep in mind that the tone and context of the situation are also important to consider when selecting the appropriate synonym.