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しんどい shindoi
Exhausting. Too much.
What does shindoi mean?
Body-tired, heart-tired, or both. Also used when your favorite is so charming that it physically hurts.
Example
今週、まじでしんどい。
This week is seriously exhausting.
Vibe
Who you can say this to, and how it lands.
Safe to use Fine in ordinary conversation.
The story behind shindoi
Shindoi is a western Japanese word that went national. It is usually traced to an older term for hardship and toil, reshuffled by generations of mouths, and it kept the specific texture of that origin: not sharp pain, but the heaviness that arrives after too much has been asked of you.
What makes it modern is the second usage. Fandom borrowed it to describe being overwhelmed by something wonderful, so a beloved performer smiling can leave you shindoi in exactly the register you would use for a fourteen-hour shift. The joke depends on the honesty of the first meaning. Adoration, it turns out, is genuinely tiring.