i-adjective
impudent; shameless; brazen; cheeky; presumptuous
Describes a person or behavior that is overly bold, lacking modesty or consideration for others. Often used when someone asks for too much or acts too familiarly without shame.
彼は厚かましくも、またお金を貸してほしいと言ってきた。
He had the nerve to ask me to lend him money again.
そんな厚かましいお願いは聞けません。
I can't grant such a presumptuous request.