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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61. She had a sudden painful cramp in her left leg.
62. The children were surprised by the sudden entry of their teacher.
63. An autopsy eventually ascribed the baby's death to sudden infant death syndrome.
64. Drop the gun, put your hands in the air, and don't make any sudden movements.
65. He achieved sudden notoriety when the details of his private life were revealed.
66. Any unexpected circumstance that arises may catalyze a sudden escalation of violence.
67. They reported a sudden outbreak of the disease in the south of the country.
68. After a quiet spell there was a sudden flurry of phone calls.
69. A sudden engine failure forced the pilot to ditch .
70. A sudden peal of thunder leaves no time to cover the ears.
71. The sudden appearance of her divorced husband caused her to run away.
72. I felt a sudden urge to smash the teapot against the wall.
73. In 'a sudden movement',[sentencedict.com] 'sudden' is an adjective in the attributive position.
74. A sudden hush fell over the room as the head teacher entered.
75. He sprang out of the room all of a sudden.
76. She was struck by the sudden thought that he might already have left.
77. A sudden terrible shriek froze the passenger to the spot.
78. All of a sudden he let out a piercing shriek.
79. All of a sudden, the car veered off the road.
80. The ship has to run into the harbor when the sudden storm arises.
81. Like a light sudden breaks through the darkness, snatching pierced my world, is not warm.
82. The sudden flash of light in the night sky was caused by a meteoric fireball.
83. Half way up the mountain a sudden, sharp wind blew up. Sentencedict.com
84. Her spirits took a sudden nosedive after her husband's death.
85. He was writing his essay when, all of a sudden, he was seized with giddiness.
86. The sudden appearance of a policeman caused the thief to run away.
87. Sudden noises scare her.
88. The sudden resignation of the financial director put the company in a very vulnerable position.
89. Startled by the sudden whistle of the train, the horse broke away.
90. Her sudden appearance did not seem to perturb him in the least.
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.