"Yeah, right"

IMSURE

This sarcastic reply often follows a statement you clearly don’t believe, like when someone claims they’ll finish their homework in five minutes.

The clue ""Yeah, right"" is a sarcastic way to express doubt, like when someone says something unbelievable and you reply with mock agreement. The answer "IMSURE" plays on this by mimicking a sarcastic tone—it’s what you might say when you’re not actually sure at all. The wordplay relies on the contrast between the literal meaning of "I’m sure" and its common sarcastic use in conversation. Think of it as the crossword’s way of winking at how people use phrases ironically.