in a daze; absent-mindedly; vacantly; abstractedly; blankly; idly
dimly; hazily; faintly; vaguely; indistinctly
with a roar (of flames); with a whoosh; flaring up
ぼーっと外を眺めていた。
I was staring blankly out the window.
疲れたのかぼーっとしている。
She seems tired — she's just sitting there in a daze.
授業中、ぼーっとして先生の話を聞いていなかった。
I zoned out in class and missed what the teacher was saying.