badly
bad-ly
adverb
In an unsatisfactory, incompetent, or inferior manner; not well.
"The team played badly and lost the match."
adverb
To a severe or serious extent; causing significant harm or distress.
"He was badly hurt in the car crash."
Thesaurus
Synonyms: severely, gravely, seriously, ill, poorly, disadvantageously, bad, mischievously, naughtily
Antonyms: advantageously, good, well