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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151. I fail to see why you find it so amusing.
152. After talking non-stop for two hours, her voice started to fail.
153. He found it increasingly difficult to read, for his eyesight was beginning to fail.
154. It seems that the private lives of movie stars never fail to fascinate.
155. Firms that fail to take advantage of the new technology will go out of business.
156. We will never fail to live up to what our parents expect of us.
157. The various sections of the report fail to cohere into a satisfactory whole.
158. My parents will be disappointed in / with me if I fail to get the master degree.
159. His health began to fail under the heavy pressures of the job.
160. Most marriages fail after between five and nine years. Nevertheless, people continue to get married.
161. Buck up ! Lots of people fail their driving test first time.
162. I would fail my exams but that the classmates help me with my lesson.
163. They are bound to fail if they continue at the risk of all these dangers.
164. "I fail to understand what you're suggesting, " said Clare archly.
165. No one can fail to be struck by the vibrancy of New York.
166. Doctors notoriously neglect their own health and fail to seek help when they should.
167. When the Export Department began to fail, Mr. Smith took it in hand and made a success of it.
168. The army was put on alert as the peace talks began to fail.
169. I've warned you. If you fail, don't come snivelling back to me.
170. If they fail[sentencedict.com], they can often resit the next year.
171. Her comment?"You can always try again if you fail"?was hardly reassuring.
172. In public he supported the official policy, but privately he was sure it would fail.
173. Many students drop out or fail because they're not enjoying the course.
174. It seems the expedition is predestined to fail because there have been so many problems.
175. I will give you a present on your birthday without fail.
176. I wouldn't lose courage even if I should fail ten times.
177. Although I support the project in public, my private opinion is that it will fail.
178. Millions of travellers fail to take even the most elementary of precautions.
179. Teachers who fail to fall in line with the new regulations may face dismissal.
180. Motorists who fail to stop risk an even higher penalty.