无故[wú gù]
词典without cause or reason：无故；坐。
词典for no reason：无缘无故；没有理由的；无端；平白。
词典without reason：不合乎情理。
无故的意思
without cause or reason; for no reason:
例：无故责备
blame sb. for nothing;
无故迟到
be late without reason;
无故旷工
absent from work without reason;
无缘无故
without reason or cause