You cannot/could not but… Definition 1 of 3Pro Tip 1/3Unavoidable Likability Use when you feel compelled to admire someone's positive qualities. He's such an honest person, you cannot but respect him. Pro Tip 2/3Compulsive Reaction Expresses an action or feeling that seems automatic due to someone's behavior or qualities. With her sense of humor, you cannot but laugh. Pro Tip 3/3Irresistible Traits Highlights the irresistible nature of something that makes you react a certain way. Seeing the puppy's eyes, you could not but cuddle it.