What characteristic is associated with something described as glacial?

Describing something as "glacial" primarily refers to its connection with ice, specifically relating to or derived from a slowly moving mass of ice. The term originates from the Latin word "glacies," meaning ice. This characteristic conveys not just the physical properties of ice but also suggests slowness and coldness in various contexts, such as glacial movements being slow and deliberate.

The other choices do not align with the meaning of "glacial." For instance, having superior power and influence does not relate to ice or cold. Similarly, being unpleasant to look at or completely neat and clean does not connect to the icy qualities suggested by the term "glacial." Hence, the first option stands out as the most accurate representation of the characteristic associated with the term.