Unpassion

Oh! merry days of unpassion, never to return / Oh! infancy! thou hast fled, fled, fled, but whither?

Source: wiktionary

we exercise our cool minds in the cool air and try for unpassion but the ache of the red desert sings silently like a cicada before emerging from the night

Source: wiktionary

Its aim was achievement of "ataraxy," "un-stirred-up-ness" or tranquillity, a condition of the soul not very different from Stoic "apathy" or "unpassion."

Source: wiktionary