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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91. Your marriage was very sudden. Have you thought things over properly?
92. She had learnt to live with his sudden changes of mood and erratic behaviour.
93. A sudden gust of wind blew his sunshade inside out.
94. She was agitated by his sudden appearance at the party.
95. He had a sudden impulse to stand up and sing.
96. She doesn't take kindly to sudden change.
97. The sudden movement threw him off balance.
98. This sudden development turned all our plans topsy-turvy.
99. I'd strongly advise against making a sudden decision.
100. He made a sudden turn to the right.
101. He gave a sudden jerk of his head .
102. She felt a sudden flush of anger.
103. A sudden scream pierced the silence.
104. His sudden death turned her world upside down.
105. He put on a sudden burst of speed.
106. The demise of the company was sudden and unexpected.
107. His words were choked off by the sudden screams.
108. The sudden interruption stopped Beryl in mid-flow.
109. The hospital got a sudden windfall of ￡300 000.
110. I felt a sudden irritation against Darren.
111. She lowered her lashes in sudden embarrassment.
112. The boy made a sudden lunge for his wallet.
113. A sudden glance of the sword cut his shoulder.
113. Sentencedict.com is a sentence dictionary, on which you can find nice sentences for a large number of words.
114. The secretary's sudden departure disorganized the whole company.
115. She stared at him in sudden recollection.
116. A sudden snowstorm paralysed the city.
117. The horse was badly frightened by the sudden noise.
118. They saw a sudden gleam of light.
119. Accidents and sudden illnesses are no respecters of age.
120. She seems unfazed by her sudden success and fame.
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.