Professor Mumblemouth 

A knowledgeable grey haired professor, who has a habit of literally mumbling while delivering a lecture, making it hard to comprehend.

Derivation- Inspired by the definition of the word mumblemouth on urban dictionary.

Professor Pandey warned his colleagues- " Speak loud and clear! Or else students will call you Professor Mumblemouth. "

Professor Mumblemouth by Nodcrafty charlatan March 15, 2022