Upekkha (say "oo-peck-kah") gets translated equanimity, and one Buddhist teacher described it as a perfect, unshakable balance of mind rooted in insight, which is a much higher bar than just staying calm. The old commentaries even name a specific trap, calling it the near enemy: a flat, checked out indifference that looks like equanimity from a distance but is really just unwillingness to look closely at anything. Real upekkha doesn't numb you to what's happening, it keeps you seeing clearly while nothing pulls you off balance. That's the test worth using on yourself. When the inbox or the news produces its first flash of irritation this morning, notice whether the calm you reach for is still seeing the situation plainly, or whether it's just checking out and calling it fine. Only one of those is actually the balance this word is naming.