When you don't know the answer to something or you're uncertain about a situation, you may say, "I couldn't tell you." However, there are a variety of synonyms that you can choose from to express the same sentiment. Some of these include "I have no idea," "I'm unsure," "I'm clueless," "I'm in the dark," "I don't know," "I'm not certain," "I'm ignorant," and "I'm at a loss." Each one of these phrases conveys a lack of knowledge or understanding and can be used interchangeably depending on the situation and context.
