mindless vs vacant

mindless and vacant both are adjectives.

Word	Noun	Adjective	Verb	Adverb
mindless	No	Yes	No	No
vacant	No	Yes	No	No

As adjectives, mindless and vacant are synonyms defined as:

Other synonyms of mindless include vacuous.

mindless (adjective)	vacant (adjective)
not mindful or attentive	without an occupant or incumbent
devoid of intelligence or thought	devoid of intelligence or thought
lacking the thinking capacity characteristic of a conscious being
requiring little mental effort
not marked by the use of reason