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きつい kitsui
Rough. Physically, mentally, or both.
What does kitsui mean?
One adjective for a brutal shift, jeans that no longer fit, and a comment that went too far. Modern slang adds a fourth sense: too much to watch, cringe-level rough.
Example
今日のシフト、地味にきつい。
Today's shift is quietly brutal.
Vibe
Who you can say this to, and how it lands.
Friends only Casual. Natural with friends, out of place at work or with strangers.
The story behind kitsui
The core idea is tightness, and everything else radiates from it. Clothes are きつい when they squeeze, a schedule is きつい when there is no slack in it, a person is きつい when their words leave no room to breathe. One adjective, several kinds of pressure, and native speakers rarely notice they are switching between them.
The newest branch is the one to watch for online. A video, a joke or an outfit can be きつい, meaning it is hard to sit through, somewhere between painful and embarrassing. It is a softer landing than saying something is bad, because it describes your own difficulty rather than the thing's quality. Convenient, and just deniable enough.