Definitions

1. adjective

the most mad or enraged; most foolish or unreasonable

“He was the maddest person I had ever seen at the sports game.”

2. adverb

in a mad or enraged manner; to the utmost extreme

“She was behaving the maddest way possible at the party.”

3. noun

the state of being the most mad or enraged; the most foolish or unreasonable thing

“His maddest was that he refused to apologize.”