1. (

• suddenly ,
• all_of_a_sudden ,
• of_a_sudden

) happening unexpectedly; "suddenly she felt a sharp pain in her side" ;

2. (

• abruptly ,
• suddenly ,
• short ,
• dead ,

) quickly and without warning; "he stopped suddenly" ;

3. (

• on_the_spur_of_the_moment ,
• suddenly ,

) on impulse; without premeditation; "he decided to go to Chicago on the spur of the moment"; "he made up his mind suddenly" ;