Synonym: decline, fade, flunk, lose out, neglect, weaken. Antonym: succeed. Similar words: fail to, faint, unfair, affair, fairly, fair play, sail, rail. Meaning: [feɪl] 
v. 1. fail to do something; leave something undone 2. be unsuccessful 3. disappoint, prove undependable to; abandon, forsake 4. stop operating or functioning 5. be unable 6. judge unacceptable 7. fail to get a passing grade 8. fall short in what is expected 9. become bankrupt or insolvent; fail financially and close 10. prove insufficient 11. get worse.
v. 1. fail to do something; leave something undone 2. be unsuccessful 3. disappoint, prove undependable to; abandon, forsake 4. stop operating or functioning 5. be unable 6. judge unacceptable 7. fail to get a passing grade 8. fall short in what is expected 9. become bankrupt or insolvent; fail financially and close 10. prove insufficient 11. get worse. 
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1. Failing to plan is planning to fail. 
2. If doctors fail thee, be these three thy doctors; rest, cheerful-ness, and moderate diet.
3. Resolve to perform what you ought; perform without fail what you resolve.
4. A man can fail many times, but he isn't a failure until he begins to blame somebody else.
5. Whether you fail or fly, at least you tried.
6. If you fail,don't forget to learn your lesson.
7. I swear I'll never fail you again.
8. The various elements of the novel fail to cohere.
9. It looks likely that the peace talks will fail.
10. Diligent students occasionally fail this subject.
11. Try and fail, but don't fail to try.
12. The light was beginning to fail .
13. By failing to prepare, you are preparing to fail.
14. I fail to comprehend their attitude.
15. If you don't work hard, you may fail.
16. You'll fail in French unless you work harder.
17. It was fated that we should fail.
18. I fail to see the logic behind his argument.
19. The song can't fail to be a hit .
20. One in ten will fail.
20. Sentencedict.com is a online sentence dictionary, on which you can find nice sentences for a large number of words.
21. Many diets fail because they are boring.
22. You will fail unless you work hard.
23. If you fail to prepare, you're prepared to fail.
24. The toys fail to conform to current safety standards.
25. She was fearful that she would fail.
26. His disability caused this thing to fail.
27. She expects to fail the exam.
28. It's no joke when your brakes fail on the motorway.
29. If you fail now, who will pick up the pieces?
30. In life's earnest battle they only prevail, who daily march onward and never say fail.