Late 16th century; earliest use found in Thomas Newton (d. 1607), translator and Church of England clergyman. From classical Latin supervacuus that is in excess of what is required, superfluous, redundant + -ous.
Definition of supervacuous in US English:
supervacuous
adjective
rare
= supervacaneous.
Origin
Late 16th century; earliest use found in Thomas Newton (d. 1607), translator and Church of England clergyman. From classical Latin supervacuus that is in excess of what is required, superfluous, redundant + -ous.