Conversation so far:
Is The Master from Doctor Who a very intelligent person?
The Master and the Doctor are shown to have similar levels of intelligence, and were classmates at the Time Lord Academy on Gallifrey, where the Master outperformed the Doctor.
What makes The Master (Doctor Who) brilliant?
Was The Master from Doctor Who liked by others?
The Tenth Doctor calls the transformed and disguised Master a genius and shows admiration for his intellect before discovering his true identity.

Question: What was his attitude?
Self-contained rewrite: What was The Master from Doctor Who's attitude?