Upekkhā (fem.) = looking on; mental poise; mental balance; equanimity; non-reactivity; composure [upa + √ikkh + ā]
✅ As one of the 4bv☮️, this attitude is unlimited, impartial, universal and applies to all beings without exception ^{MN 21}.
✅ Upekkhā should be done concurrently with sati, samādhi, 4 jhānas (4j🌕), maintained at all times and all postures. ^{AN 8.63 and A-byāpāda, A-vihiṃsā-saṅkappo of 👑8☸ → 2💭}
✅ Upekkhā is equivalent or nearly identical in the many sets of Dharmas it appears in, as part of 4bv☮️, 3rd and 4th jhāna, as part of 7sb awakening factors, 5abi, etc. See details in 7🛆👁.
⛔ Upekkhā is not indifference to others' suffering.
⛔ Upekkhā is not temporary indifference/boredom to sensual pleasures, with underlying passion still latent and just waiting to emerge later when one gets hungry or lustful again. ^{MN 137}.