Dark as opposed to light. Dry as opposed to liquid. I tend to think of dry sound as where you get the technical detailing of the sound, but it is just the patterns, the beat of the sound, but perhaps it does not feel alive, smooth, 'liquid', mellifluous.
Lol Lloyd; audio language is a vast and complicated language indeed.
Take a song for example; its words, its tone, its incantation, its resonance, ...
it has a different meaning, different 'emotional sound', to each one of us.
In Audio nothing is absolute; the music, the sounds, and even the words to describe it.
Me honestly thinks.