don't even look like (something)
Do not appear as if you are doing or considering something. Don't even look like you're about to talk, or the teacher will yell at you.
Don't even look like (something!)
Do not even appear to be doing something! (The something can be thinking about something or actually doing something.) Mary: Are you thinking about taking that last piece of cake? Bob: Of course not. Mary: Well, don't even look like you're doing it! John: You weren't going to try to sneak into the theater, were you? Bob: No. John: Well, don't even look like it, if you know what's good for you.