* Formal: "After weeks of searching for a solution, I was at my wit's end and had to seek professional help."
* Informal: "My kids have been driving me crazy all day, I'm at my wit's end!"
* Figurative: "The constant noise from the construction project had me at my wit's end, I couldn't focus on anything else."
* Emphasizing frustration: "I'm at my wit's end trying to get this website to work. Everything I try just fails!"
"At wit's end" implies a state of extreme frustration or helplessness, usually after trying everything possible to solve a problem.