Nice!

If lurking beneath each use of "nice" -- eg nice guy, nice time, have a nice day -- we learn that the etymology is...

nice

late 13c., "foolish, stupid, senseless," from O.Fr. nice "silly,foolish," from L. nescius "ignorant," lit. "not-knowing," from ne-"not" (see un-) + stem of scire "to know."

Well, it could change our understanding of hearing and using it.