頭あたまから

adverb

from the beginning; without hesitation; flatly

Used for doing something right from the start, or for rejecting/refusing outright without any hesitation. Often with verbs like 断る, 否定する, or 決めつける.

• 彼かれの提てい案あんを頭あたまから否ひ定ていするのはよくない。

  It's not good to reject his proposal out of hand.

• その話はなしは頭あたまから信しん用ようしていなかった。

  I didn't believe that story from the very beginning.

adverb

entirely; completely

Emphasizes that something is done or applies to the whole thing, without exception. Often used with verbs like 無視する, 忘れる, or 変える.

• 彼かれは私わたしの忠ちゅう告こくを頭あたまから無む視しした。

  He completely ignored my advice.

• その計けい画かくは頭あたまからやり直なおす必ひつ要ようがある。

  The plan needs to be redone entirely from scratch.

adverb

head-on; head-first

Describes a direct, often physical collision or confrontation. Also used metaphorically for tackling a problem directly.

• 車くるまがガードレールに頭あたまから突つっ込こんだ。

  The car crashed head-on into the guardrail.

• 彼かれは難むずかしい問もん題だいに頭あたまから取とり組くんだ。

  He tackled the difficult problem head-on.