What's the adjective for exacteth? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs exact and exactify which may be used as adjectives within certain contexts.
“Classifying the case particulars is an exacting task. It requires intimate knowledge of the guide points and their concrete referents.”
“Not only was it difficult for me to work with such an exacting boss, it was difficult for others. I soon became so stressed out that I began to look for another position.”
“Now he was to be thrown into the crucible of a pennant race in New York City, under the most exacting manager the game had ever known.”