mushin

uncountable

A mental state free from anger, fear, etc., into which expert martial artists are said to enter during combat.

Japanese Meaning

怒りや恐怖などの感情から解放され、心が平静である状態 / 戦闘中に熟練の武術家が示す、精神が集中して雑念がない状態

In the final bout, he slipped into mushin and reacted without hesitation.

決勝戦で彼は無心の境地に入り、ためらうことなく反応した。

Sense（1）

A mental state free from anger, fear, etc., into which expert martial artists are said to enter during combat.