How to say "spontaneously" in Japanese
Choosing the right word
- 思わずおもわずadverbCovers the sense of doing something spontaneously without conscious intent: an involuntary, reflexive reaction, as when you burst out laughing or let out a cry before you can stop yourself.
- 天然にてんねんにadverbA less common word that really means 'naturally'; it fits 'spontaneously' only where something happens by nature, not by design. For a person reacting without meaning to, it is seldom the word you want.
Use 「思わず」 when someone does something spontaneously without meaning to — an involuntary, reflexive reaction; 「天然に」 is a less common word that really means 'naturally', so it suits only the by-nature sense.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only
Japanese equivalents
See also
This browser can't play pronunciations (needs Safari 18.4 or later, or Chrome / Edge / Firefox).
