sudden

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sudden /ˈsʌdn̩/ adjective
sudden
/ˈsʌdn̩/
adjective
Learner's definition of SUDDEN
[more sudden; most sudden]
: happening, coming, or done very quickly in a way that is usually not expected

all of a sudden

: suddenly

— suddenness

/ˈsʌdn̩nəs/ noun [noncount]