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Holographic soundstage (I get what they mean, but there are better ways to describe this)
Romantic mids (no idea what this means)
Sweet (often used to describe mids)
Velvety (often used to describe treble)
Syrupy (seriously, I've seen this one used often!)
I think these 4 come down to variations in frequency response.
A slight increase in the low end gives a warm feel, combined with attenuation at the high end may result in a dark or muffled feeling.
Cold and brittle would probably be varying degrees of too much high frequency content.
I believe these terms are adequate, after all we don't always know what exact frequency (or freq. range) is causing our perceived sensations.
No clue about the other ones though. Especially "buttery". I mean I know the term from discussions about the perceived fluidity of high refresh rate / variable refresh rate monitors but in audio? *shrug*
That's why I compare in absolute terms and disregard the price. That's what lets me compare $100 stuff with $1,000 or even more just to see which one is better, regardless of price. It is an eye-opener when you disregard price and then consider price after the comparison.