Most Useful Audio Adjective

The best system I've ever heard was at CES 2005.
Halcro played Peter McGrath digital master tapes through Wilson X-II speakers via EMM DAC (if memory serves).
Surround setup used Sophia's in the back.
The whole thing was in a large hall (60 X 60 est.) in the conference center across from the (then) San Remo.
As we all know, The San Remo is now the Hooters Casino (Squeezers Palace).
Although it took three days to settle in, on the third day that system sounded, in every respect, "Real".

Remember this one?

Boss

Gonna have to go with holographic here - mostly because most of us have never seen one...

Jaw dropping. I have heard this one so often, I think audiophiles all have dislocated jaws.

While is more than just an adjective, I always appreciate the phrase "Recommended by Stereophile"

I always know what that means! Oh yeh! :-)