undone vs sunk

undone and sunk both are adjectives.

Word	Noun	Adjective	Verb	Adverb
undone	No	Yes	No	No
sunk	No	Yes	No	No

As adjectives, undone and sunk are synonyms defined as:

Other synonyms of undone include done for, ruined, washed-up.

undone (adjective)	sunk (adjective)
thrown into a state of disorganization or incoherence	doomed to extinction
not fastened or tied or secured
not done
doomed to extinction