彼は厚かましくも

he shamelessly

→ 彼
phrase Rare #38,631
he shamelessly Expresses strong disapproval of someone's shameless or brazen behavior. The も adds emphasis, similar to “even” or “daringly.”
JA: 彼は厚かましくも私に頼みごとをしてきた。
EN: He shamelessly asked me for a favor after ignoring my advice.

彼は厚かましくも嘘をついた

He had the nerve to lie.

彼は厚かましくも助けを求めてきた

He had the nerve to ask for help.

彼は厚かましくも私に結婚してくれないと言った

He had the nerve to ask me to marry him.

彼は厚かましくも先生の助言を無視した

He had the nerve to ignore his teacher's advice.