頭あたまごなし

adverb, noun

unsparingly; without listening; without giving a chance to explain

Almost always used in the adverbial phrase 頭ごなしに, meaning to reject, scold, or criticize someone without hearing them out or giving them a chance to explain.

• 彼かれは私わたしの言いい分ぶんを聞きかずに、頭あたまごなしに否ひ定ていした。

  He rejected my opinion out of hand without listening to what I had to say.

• 上じょう司しに頭あたまごなしに叱しかられて、何なにも言いえなかった。

  I was scolded unsparingly by my boss and couldn't say anything.