The phrase "pulled one's leg" is commonly used to describe a situation in which someone is joking around or teasing another person in a lighthearted or playful manner. The antonyms for this phrase would be more serious in nature, such as "being serious," "speaking honestly," or "telling the truth." These phrases imply that the speaker is not joking around or trying to deceive the listener in any way. Additionally, antonyms for "pulled one's leg" could be "insulting," "criticizing," or "belittling," which indicate that the speaker is intentionally trying to harm or demean the listener.