Boketto
Etymology
Japanese ぼけっと, related to "boke," to be absent-minded or blurred. It describes the mind slipping into neutral, eyes open but attention nowhere in particular.
noun · /boh-KET-toh/
The act of gazing vacantly into the distance while thinking about nothing at all.
What it names
It dignifies blank, purposeless staring — mental idling — by giving it a name, and quietly frames it as restful rather than lazy.
Example
She caught herself in a long boketto at the train window, the city sliding by unregistered.
Related idea
Unlike reverie, which is a drift through vivid daydreams, boketto is emptier still — the mind not wandering anywhere, just idling.