run-down vs flea-bitten

run-down and flea-bitten both are adjectives.

Word	Noun	Adjective	Verb	Adverb
run-down	No	Yes	No	No
flea-bitten	No	Yes	No	No

As adjectives, run-down and flea-bitten are synonyms defined as:

Other synonyms of run-down include creaky, decrepit, derelict, woebegone.

run-down (adjective)	flea-bitten (adjective)
having the spring unwound	worn and broken down by hard use
worn and broken down by hard use