#1 suddenly r. [all of a sudden, of a sudden] happening unexpectedly; "suddenly she felt a sharp pain in her side". wn
#2 suddenly r. [abruptly, short, dead] quickly and without warning; "he stopped suddenly". wn
#3 suddenly r. [on the spur of the moment] on impulse; without premeditation; "he decided to go to Chicago on the spur of the moment"; "he made up his mind suddenly". wn
vizzz