- I'd strongly advise against making a sudden decision.
- Everyone in the office was surprised by Graham's sudden departure.
- There was a sudden loud noise.
- A sudden gust of wind blew his umbrella inside out.
- A sudden snowstorm paralysed the city.
Thesaurus: synonyms and related words
- ad hoc
- ad lib
- against (all) the odds/against all odds idiom
- all at once idiom
- all of a sudden idiom
- it's just one of those things idiom
- just like that idiom
- make sth up as you go along idiom
- muddle along
- undreamed of
noun [ U ] uk /ˈsʌd.ən.nəs/ us /ˈsʌd.ən.nəs/