The assiduous administrator was arrantly furious and when she learned he had equivocated. (drop the ‘and’ … and finish the thought.)

(Changed to:)*****The assiduous tone of the administrator was arrantly furious, when she learned he had equivocated his explaination about his involvement in the start of the riot.

Especially with forbearance, precarious, and equivocated.

“Not known for his forbearance, the detention officer glared at Henry as the boy explained why he had malingered that morning.”

“The assiduous administrator arrogantly reprimanded Henry as he equivocated about his misdemeanor.”