ailing vs indisposed

ailing and indisposed both are adjectives.

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

As adjectives, ailing and indisposed are synonyms defined as:

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

ailing (adjective)	indisposed (adjective)
somewhat ill or prone to illness	(usually followed by `to') strongly opposed
	somewhat ill or prone to illness