How to say "instinctively" in Japanese

Choosing the right word
  • 思わずおもわずJLPT N3approx.Common
    adverbThe common, everyday choice for the basic sense of 'instinctively': acting spontaneously, almost reflexively, before you have time to think — blurting something out, flinching, or reaching out a hand.
    彼かれは思おもわず笑わらった。↗
    He laughed in spite of himself.
  • 我知らずわれしらず
    adverbA less common alternative: it stresses acting without realizing it, unaware of yourself, often as emotion carries you along — tears welling up before you know it. For plain 'instinctively', 思わず is the usual choice.

For the everyday sense of reacting instantly without thinking, 「思わず」 is the usual choice; 「我知らず」, a less common word, fits actions done without your realizing, when you notice only afterwards.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese equivalents

JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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