adj. unexpected, unannounced, unanticipated, unforeseen; unwonted, surprising, startling; precipitate, abrupt, quick, immediate, rapid, swift, brisk; impetuous, hasty, rash, impulsive His sudden turn caught us off balance Your change of heart was quite sudden.
SUDDEN
Meaning of SUDDEN in English
Oxford thesaurus English vocab. Английский словарь Оксфорд тезаурус. 2012