look right through
look right through somebody
to behave as if you do not see someone He tried to engage the woman next to him in conversation, but she looked right through him.
Usage notes: usually said of someone who is trying to ignore someone else
look right/straight through somebody
to behave as if you do not see someone when you look at them, either because you do not notice them or because you are ignoring them I'm sure I was at school with that girl, but she just looked straight through me.