"Valence, or hedonic tone, is the affective quality referring to the
intrinsic attractiveness/'good'ness (positive valence) or
averseness/'bad'-ness (negative valence) of an event, object, or
situation" (Wikipedia)

Alternatively, valence, or hedonic tone, is the affective quality
referring to the intrinsic attractiveness/"good"-ness (positive
valence) or averseness/"bad"-ness (negative valence) of experience.

Suffering, or more generally hedonically sub-zero experience, is the
intrinsic valence carrier of disvalue in the universe.

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(Credit to David Pearce and Lucas Perry for this definition.)