(`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner
not well
e.g. he was ill prepared
e.g. it ill befits a man to betray old friends
e.g. the car runs badly
e.g. he performed badly on the exam
e.g. the team played poorly
e.g. ill-fitting clothes
e.g. an ill-conceived plan
Synonym: ill badly