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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1. Hasty climbers have sudden falls.
2. Her sudden departure has disarranged my plans.
3. A sudden gust of wind blew the door shut.
4. His thigh muscle gave a sudden jerk.
5. The sudden increase in sales is easily explicable.
6. A sudden gust of cold wind made me shiver.
7. A sudden thunderstorm had drenched us to the skin.
8. A sudden movement caught my eye.
9. The sudden jolt plunged her forward.
10. Life seemed on a sudden empty and meaningless.
11. A sudden glare of headlights lit the driveway.
12. A sudden wind swept a pile of leaves in.
13. So why your sudden mania for exercise?
14. There was a sudden stillness in the air.
15. The sentry defended the gate against sudden attack.
16. He experienced a sudden pang of conscience.
17. Everyone was a bit puzzled by her sudden departure.
18. The sudden noise frightened the birds to take wing.
19. All of a sudden we heard an unearthly cry.
20. His sudden departure had demonstrated how unreliable he was.
21. Anna squinted in the sudden bright sunlight.
22. There was loud bang and a sudden blinding light.
23. Her sudden towering rages were terrifying.
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24. The sudden weakness in her legs made her stumble.
25. He repressed a sudden desire to cry.
26. He made a sudden decision to visit his brother.
27. A sudden storm overtook us.
28. He made a sudden stand.
29. The child made a sudden dart across the road.
30. A sudden roar came from the expectant crowd.
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.