動詞 fail:

1. fail to do something; leave something undone
   同義詞：fail, neglect
2. be unsuccessful
   同義詞：fail, go wrong, miscarry
3. disappoint, prove undependable to; abandon, forsake
   同義詞：fail, betray
4. stop operating or functioning
   同義詞：fail, go bad, give way, die, give out, conk out, go, break, break down
5. be unable
   同義詞：fail
6. judge unacceptable
   同義詞：fail
7. fail to get a passing grade
   同義詞：fail, flunk, bomb, flush it
8. fall short in what is expected
   同義詞：fail
9. become bankrupt or insolvent; fail financially and close
   同義詞：fail
10. prove insufficient
    同義詞：fail, run out, give out
11. get worse
    同義詞：fail

形容詞 failed:

1. unable to meet financial obligations
   同義詞：failing

1. If it had not been for his help, I should have failed.
   如果沒有他的幫忙，我應該已經失敗。
2. But for your advice, I should have failed.
   要不是你的忠告，我會失敗的。
3. Blood can be cleaned by osmosis if the kidneys have failed.
   若腎功能衰退，可通過滲透作用使血液凈化。
4. The government's repression of the strike failed.
   政府對這次罷工的鎮(zhèn)壓失敗了。
5. His speech failed in proof.
   他的演講缺乏證據。
6. Their business has failed and is in the hands of the receiver.
   他們的公司垮了，現(xiàn)在由破產管理人管理。
7. The business faltered and then failed.
   商行生意衰退，最后倒閉了。
8. I tried to fix the equipment but I failed.
   我想把機器修理好，但是失敗了。

failed

adj.（形容詞）
Having undergone failure:
不成熟的：
例句：
new economic policies intended to replace the failed ones of a past administration.
新的經濟政策將取代上屆中央政府不成熟的經濟政策