Tā suīrán cūxīn, dàn hái bùzhì fàn zhè zhǒng cuòwù.
Careless as he is, he wouldn't go so far as to make this kind of mistake.
Tips
usage
More formal/written than 不会. Often paired with 就 or 才 to express the avoided outcome. Do not confuse with 不至于, which is longer and can stand alone as a response.