unintentional vs designed

unintentional and designed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unintentional	No	Yes	No	No
designed	No	Yes	No	No

As adjectives, unintentional and designed are synonyms defined as:

unintentional and designed: done or made or performed with purpose and intent

Other synonyms of unintentional include intentional.

unintentional (adjective)	designed (adjective)
done or made or performed with purpose and intent	done or made or performed with purpose and intent
not done with purpose or intent