This is the 2894th most frequent Japanese word.
ふと
"ふと" means "suddenly" or "unexpectedly."
Usual meaning of 'ふと' to indicate an action occurring suddenly or spontaneously.
ふと思い出したことがある。
I suddenly remembered something.
'ふと' is used to express the sudden onset of an emotional state.
窓の外を見ると、ふと懐かしい気持ちになった。
Looking out the window, I was suddenly filled with nostalgia.
Indication of a sensation or realization happening spontaneously.