Anabhisnehah — without sticky attachment. Not cold, not distant, just unglued. Such a person meets good fortune without tipping into giddy celebration and meets misfortune without tipping into bitterness. The wisdom of such a person, Krishna says, is established.
This is not emotional flatness. A boat sits on water but water does not sit in the boat. The Sthitaprajna lives fully in the world. Events touch him. But they do not flood him. He stays afloat, balanced, responsive rather than reactive.