unwell vs indisposed

unwell and indisposed both are adjectives.

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

As adjectives, unwell and indisposed are synonyms defined as:

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

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