A metaphor meaning something that has no effect on someone or something; being unaffected by something.

ऐसा कुछ जो किसी पर कोई असर ना डाले

English Usage: Criticism is like water off a duck's back for her; she doesn't let it bother her.

Hindi Usage: आलोचना का उस पर कोई असर नहीं होता, यह उसके लिए बेमतलब है।