ailing

(verb) be ill or unwell. Synonyms: ail.

(verb) cause bodily suffering to and make sick or indisposed. Synonyms: trouble, ail, pain.

(adj) somewhat ill or prone to illness. Synonyms: indisposed, peaked(predicate), poorly(predicate), sickly, unwell, under the weather, seedy. Examples: "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."