worthless vs purposeless

worthless and purposeless both are adjectives.

Word	Noun	Adjective	Verb	Adverb
worthless	No	Yes	No	No
purposeless	No	Yes	No	No

worthless (adjective)	purposeless (adjective)
lacking in usefulness or value	not evidencing any purpose or goal
morally reprehensible	serving no useful purpose; having no excuse for being