"Browned off " means:

Explanation

The phrase 'browned off' is an informal British expression meaning to be annoyed, irritated, or dissatisfied. The correct answer is 'discouraged,' which aligns with the sense of frustration and dissatisfaction implied by the expression. 'Grilled properly' and 'cleaned' are unrelated to the emotional state described, and 'bored' only partially captures the meaning, as it lacks the intensity of irritation or dissatisfaction.