Which tempo marking indicates a slow pace but faster than grave?

The indication of a slow tempo that is faster than grave is accurately captured by the term adagio. Adagio generally signifies a pace that is slow but is characteristically more lively than grave, which is one of the slowest tempo markings. In musical contexts, adagio allows for a leisurely flow while providing more movement compared to the solemnity of grave.

Although largo also suggests a slow tempo, its pace is typically broader and can often be considered slower than adagio. Allegro, on the other hand, indicates a quick and lively tempo, while vivace suggests a very lively and fast pace, both of which are much faster than adagio. Therefore, adagio is indeed the correct choice as it encompasses the desired tempo characteristics mentioned in the question.