生疏
shēngshū
1) not familiar
我对这个地方很生疏。 I am not familiar with this place.
2) out of practice; rusty
我对弹钢琴开始生疏了。 I'm beginning to get out of practice on the piano.
3) not as close as before; estranged
他们的关系生疏了。 Their relationship was not as close as before.