badly
Definitions
In an unsatisfactory, inadequate, or unsuccessful way.
In a severe, serious, or harmful manner.
To a great degree; very much.
Examples
The team played badly during the first half of the game.
He was badly injured in the accident and required immediate medical attention.
Synonyms
poorly awfully terribly incompetently unsatisfactorily inadequately shoddily
Antonyms
well excellently skillfully admirably perfectly superbly competently