Synonym: abrupt, hasty, impetuous, impulsive, unexpected, unforeseen. Antonym: gradual. Similar words: all of a sudden, buddy, added, a good deal, a good deal of, deny, dense, denial. Meaning: ['sʌdn] 
adj. happening without warning or in a short space of time.
adj. happening without warning or in a short space of time. 
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151. A sudden storm ruled out the boat race.
152. That sudden noise made me jump.
153. A sudden flash of revelation came to him.
154. All of a sudden my heart hardened against her.
155. The sudden noise in the bushes startled her horse.
156. He had a sudden flash of inspiration .
157. I had a sudden stroke of inspiration.
158. The sudden thaw means that spring is here.
159. I had a sudden intuition about the missing jewels.
160. A sudden breeze rustled the long dry grass.
161. He felt a sudden sense of calm, of contentment.
162. His sudden reappearance must have been a shock.
163. Few plants will tolerate sudden changes in temperature.
164. Of a sudden her heart wrenched.
165. The engine gave a sudden judder.
166. There was a sudden fall in temperature.
167. Sudden rainstorms are frequent on the southeast coast.
168. I felt a sudden tingle of excitement.
169. A sudden silence fell over the room.
170. All of a sudden, a car came hurtling round the corner.
171. Dad brought a notebook along to the beach, in case he was seized by sudden inspiration.
172. He came to such a sudden stop that we almost hit him.
173. She was totally bewildered by his sudden change of mood.
174. The whole ship shuddered and trembled at the sudden strain.
175. The company was completely wrong-footed by the dollar's sudden recovery.
176. He'd been in a coma for weeks,(http://sentencedict.com/sudden.html) when all of a sudden he flickered an eyelid.
177. Peter had dealt admirably with the sudden questions about Keith.
178. A sudden break in the cloud allowed rescuers to spot Michael Benson.
179. His self-confidence took a sudden jolt with the news that he had not been selected.
180. The sudden cancellation of Mr Blair's trip was due to his heavy workload.
More similar words: all of a sudden, buddy, added, a good deal, a good deal of, deny, dense, denial, wooden, evident, student, density, incident, identify, resident, evidence, tendency, identity, president, diffident, identical, residence, dependent, confident, presidency, by accident, respondent, residential, schadenfreude, presidential.