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Synonyms
sud·den (sŭd́n)

[Middle English sodain, from Old French, from Vulgar Latin* subitānus, from Latin subitāneus, from subitus from past participle of subīre, to approach stealthily, sub-, secretly; see sub–, + īre, to go.]

adjective 

  1. Happening without warning; unforeseen: a sudden storm.
  2. Characterized by hastiness; abrupt or rash: a sudden decision. See synonyms at impetuous
  3. Characterized by rapidity; quick and swift.

idioms

all of a sudden
Very quickly and unexpectedly; suddenly.

derivatives

sud́den·ly
adverb
sud́den·ness
noun