Lewis & Short

in-sŏcĭābĭlis, e, adj., that cannot be joined together, unsociable, incompatible (mostly post-Aug.): gens, Liv. 37, 1: diversae, insociabilesque naturae arborum, Plin. 17, 19, 30, § 137: anum insociabilem nurui efficiebat, Tac. A. 4, 12 fin.: regnum (with discordiae), id. ib. 13, 17; 15, 68.