深居简出shēn jū jiǎn chū

平时总是呆在家里，很少外出。谓避世而独处。

例自摈弃以来，尤自刻励，深居简出，几不与世人相通。——宋·秦观《谢王学士书》

英live in the seclusion of one's own home and seldom come out; live a secluded life with few social contacts;