means A state of having no particular interest, concern, or feeling about something — neither for it nor against it.

from From Latin 'indifferentia,' built from 'in-' (not) plus 'differre' (to differ, to set apart). The root literally means 'not making a difference' — and that's the heart of it: to be indifferent is to find that nothing tips the scales one way or the other. It reached English through Old French 'indifference' in the late Middle Ages.