无补于事 wúbǔyúshì to no avail Origin Definitions Defs Strokes Stroke Words Sentences Sents 无补 無補 wúbǔ to be of no help to be of no avail or not helping in the least; useless于 於 yú preposition to Indicates the recipient or target of an action; equivalent to 对 duì or 向 xiàng事 shì noun matter matter; affair; thing; event