(`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well
He was ill prepared. It ill befits a man to betray old friends. The car runs badly. He performed badly on the exam. The team played poorly. Ill-fitting clothes. An ill-conceived plan.
source: WordNet 3.0
In a poor manner or condition; without plenty, or sufficiency, or suitable provision for comfort; as, to live poorly.
source: Webster 1913
adjective satellite
somewhat ill or prone to illness
My poor ailing grandmother. Feeling a bit indisposed today. You look a little peaked. Feeling poorly. A sickly child. Is unwell and can't come to work.