dressed to the nines vs dressed to kill

dressed to the nines and dressed to kill both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dressed to the nines	No	Yes	No	No
dressed to kill	No	Yes	No	No

As adjectives, dressed to the nines and dressed to kill are synonyms defined as:

dressed to the nines and dressed to kill: dressed in fancy or formal clothing

Other synonyms of dressed to the nines include dolled up, dressed-up, dressed, spiffed up, spruced up, togged up.

dressed to the nines (adjective)	dressed to kill (adjective)
dressed in fancy or formal clothing	dressed in fancy or formal clothing