Posted by:
Hugh Clary (---.denver-02rh15-16rt.co.dial-access.att.net)
Doesn't limpid also mean calm or serene?
[
www.google.com]
That is, calm but muddy waters.
Could also be a purposeful use of oxymoron (synoeciosis, irony, compressed paradox), but one does not normally see such devices in EBB's stuff.