A:介词:failing=in the absence,without; 在没有...否则
1.Failing new evidence,the case will surely be lost.
2.Failing a solution this afternoon,the problem will have to wait until Monday
3.Find someone who will let you talk things through,or failing that,write down your thoughts.
B:形容词:failing 衰退的=undergoing failure
1.failing health; failing kidneys; a failing business.
C:名词 failing,failings = a weak point; flaw
1.He had invented an imaginary son,in order to make up for his real son's failings.失败
2.He was quick to point out his wife's failings.缺陷/瑕疵/失败