Final answer:
Based on Filby's descriptions, Professor Dudley can be characterized as an imposing and powerful figure.
Step-by-step explanation:
Based on Filby's descriptions, Professor Dudley can be characterized as an imposing, larger-than-life figure. Filby describes Dudley as being almost twice as tall as a normal man and at least five times as wide, with long tangles of bushy black hair and a beard that hides most of his face. Dudley's physical appearance, such as his massive size and wild appearance, creates an impression of someone who is powerful and possibly intimidating.