indifference synonyms

irrelevance insignificance triviality unimportance

immunity detachment neutrality disregard alienation inertia disdain coldness coolness insensitivity stupor dullness phlegm torpor disinterest isolationism aloofness nonchalance stoicism insouciance callousness unconcern sluggishness insensibility listlessness impassivity heedlessness impassiveness noninterference