not taking no for an answer; ignoring another's disapproval
Slang noun describing a person who persists despite clear rejection or disapproval. Often used in casual, critical contexts.
That guy doesn't take no for an answer; he keeps asking me out no matter how many times I refuse.
People are fed up with his pushy attitude, ignoring their obvious discomfort.
Compound of 嫌 (iya, 'dislike, no') and 知らず (shirazu, 'not knowing'), literally 'not knowing dislike'. The exact origin is uncertain, but it likely emerged as casual slang.