The phrase "haddest a handle on" means having a good understanding or control of a situation or subject. Antonyms that can be used in place of this phrase include "completely clueless," "utterly bewildered," "totally lost," "without a clue," "in the dark," and "at a loss." These words describe someone who lacks knowledge, understanding, or control over a situation or subject. Using these antonyms in place of "haddest a handle on" can convey a sense of confusion or uncertainty, highlighting a person's lack of knowledge or ability to handle a situation.