空穴 kōngxué hole Origin Definitions Defs Strokes Stroke Words Sentences Sents 空穴来风 kōngxuéláifēng unfounded (idiom) used to describe rumors or claims that have no basis in reality; baseless; groundless空穴来风未必无因 kōngxuéláifēngwèibìwúyīn no smoke without fire (idiom) a wind does not come from an empty cave without reason; there is no smoke without fire