The antonyms for the phrase "were displeased by" could be happy, pleased, content, satisfied, elated, delighted, ecstatic, or overjoyed. These words convey positive emotions and indicate that one is satisfied or content with a situation or outcome. In contrast, "were displeased by" implies negative feelings and disappointment with something. By using antonyms to this phrase, one can communicate a shift in attitude or behavior towards something that was once disliked. Choosing the appropriate antonym can better convey one's thoughts and feelings, and help to paint a clearer picture of a situation.