ailing vs poorly

ailing and poorly both are adjectives.

Word	Noun	Adjective	Verb	Adverb
ailing	No	Yes	No	No
poorly	No	Yes	No	Yes

As adjectives, ailing and poorly are synonyms defined as:

Other synonyms of ailing include indisposed, peaked, seedy, sickly, under the weather, unwell.

ailing (adjective)	poorly (adjective)
somewhat ill or prone to illness	somewhat ill or prone to illness

ailing (adverb)	poorly (adverb)
	(`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well