Is it ensure, insure, or assure?
1883, "antagonistic to society or social order," from a- "not" + social (adj.); also cf. antisocial.
asocial a·so·cial (ā-sō'shəl)adj.
Avoiding or averse to the society of others; not sociable.
Unable or unwilling to conform to normal standards of social behavior; antisocial.