c. 1200, "wickedly; with hostility," from ill (adj.). Meaning "not well, poorly" also is from c. 1200. It generally has not shifted to the realm of physical sickness, as the adjective has done. Ill-fated recorded from 1710; ill-informed from 1824; ill-tempered from c. 1600; ill-starred from c. 1600. Generally contrasted with well, hence the useful, but now obsolete or obscure illcome (1570s), illfare (c. 1300), and illth.
mannered adj.
mid-15c., "having or possessed of manners or demeanor;" in compounds, "having manners of a certain kind;" from manner. Later, especially, "well-mannered." Also, especially in arts and literature, "characterized by mannerism, artificial, affected" (by 1801). The form ymanered is attested from late 14c. Compare mannerable "well-mannered" (late 15c.).