| Adv. | 1. | suddenly - happening unexpectedly; "suddenly she felt a sharp pain in her side" Synonyms: of a sudden, all of a sudden |
| 2. | suddenly - quickly and without warning; "he stopped suddenly" | |
| 3. | suddenly - on impulse; without premeditation; "he decided to go to Chicago on the spur of the moment"; "he made up his mind suddenly" Synonyms: on the spur of the moment |