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all of a sudden

5 syllables

Quick answer

As an adverb, all of a sudden means suddenly.

Meanings of all of a sudden

2 meanings

adverb

Suddenly
“all at once, he started shouting”
Similar: all at once
Quickly and without warning
“he stopped suddenly”
“suddenly she felt a sharp pain in her side”
“he decided to go to Chicago on the spur of the moment”
Similar: suddenly, on the spur of the moment, of a sudden, abruptly, dead, short

Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).

Synonyms by meaning

All synonyms for all of a sudden →

adverb: suddenly

adverb: quickly and without warning

suddenlyon the spur of the momentof a suddenabruptly dead short

Nearby words

all all-around all at once all-fired all-knowing all-night all-out all over all-powerful all-purpose all right all the way