Sudden Sudden synonyms abrupt sudden and abrupt precipitate sudden and precipitate unforeseen sudden and unforeseen hurried sudden and hurried unexpected sudden and unexpected hasty sudden and hasty unanticipated sudden and unanticipated quick sudden and quick swift sudden and swift precipitous sudden and precipitous Full list of synonyms (693) Sudden antonyms gradual sudden and gradual expected sudden and expected slow sudden and slow anticipated sudden and anticipated sluggish sudden and sluggish lazy sudden and lazy delayed sudden and delayed leisurely sudden and leisurely graduated sudden and graduated gradatory sudden and gradatory Full list of antonyms (20) Share this picture Share this image Share this picture Share this image