"Look like" is an idiom that means "to resemble". Therefore, the antonyms for "not look like" would be words or phrases that convey the opposite meaning of resemblance, such as "dissimilar", "unlike", "different", "contrasting", "distinct", and "opposite". Using these antonyms, we can form sentences such as "Despite being siblings, they look dissimilar" or "Their personalities were unlike each other". In essence, there are several ways to express that two things or people do not look alike, and using antonyms for "look like" can aid in expanding our vocabulary and communication skills.