peaked vs sickly

peaked and sickly both are adjectives.

Word	Noun	Adjective	Verb	Adverb
peaked	No	Yes	No	No
sickly	No	Yes	No	No

As adjectives, peaked and sickly are synonyms defined as:

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

peaked (adjective)	sickly (adjective)
somewhat ill or prone to illness	somewhat ill or prone to illness
having or rising to a peak	unhealthy looking