The term 'MORE THAN DULL' can be summarized by two crossword solutions: DRYASDUST (9 letters) and STERILE (7 letters). DRYASDUST is an adjective that means dull, lifeless, and uninteresting. It is derived from the name of a character in a novel by Charles Dickens, who was a dry and dusty lawyer. STERILE is an adjective that means lacking in imagination or creativity. It is often used to describe a situation or environment that is not conducive to growth or development. Both words are used to describe something that is more than just dull; it is lifeless, uninteresting, and unimaginative.