The term 'give unwanted advice' can be summarized by two crossword solutions: KIBITZ (6 letters) and INTRUDE (7 letters). KIBITZ is a Yiddish word that means to offer unwanted or unsolicited advice or commentary, usually in a joking manner. INTRUDE means to enter without permission or welcome, often in a disruptive way. Therefore, the two words together can be used to describe someone who gives unwanted advice in an intrusive manner.