What's the adjective for administratrix? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs admin, administer, administrate and administre which may be used as adjectives within certain contexts.
“My fertile imagination cannot be chained to administerial tasks.”
“After 1784 William Pitt the Younger emerged as the leader of a new Tory Party, which broadly represented the interests of the country gentry, the merchant classes, and official administerial groups.”