Open English Wordnet
Adjectives
(s)ailing, indisposed, peaked, poorly, sickly, unwell, under the weather, seedysomewhat 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”
Adverbs
(r)ill, badly, poorly(‘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”