peaked vs under the weather

peaked and under the weather both are adjectives.

Word	Noun	Adjective	Verb	Adverb
peaked	No	Yes	No	No
under the weather	No	Yes	No	No

As adjectives, peaked and under the weather are synonyms defined as:

Other synonyms of peaked include ailing, indisposed, poorly, seedy, sickly, unwell.

peaked (adjective)	under the weather (adjective)
somewhat ill or prone to illness	somewhat ill or prone to illness
having or rising to a peak