distant (from someone); aloof; estranged
knowing little (of); ill-informed (about); ignorant (of); unfamiliar (with); unacquainted (with)
近所との付き合いが疎い。
I'm on distant terms with my neighbors.
転職続きで昔の友人とも疎かった。
Constant job changes left me out of touch with old friends.
引越し後、旧友とだんだん疎くなっていった。
After moving, I gradually drifted apart from old friends.