"I was nonplussed when I learned that Landlady was asking $380,000 for this house, which the Bank appraised at $225,000; following which she accepted an offer of $250,000." R. Connors
tr.v. non·plused also non·plussed, non·plus·ing also non·plus·sing, non·plus·es also non·plus·ses
To put at a loss as to what to think, say, or do; bewilder.
n. A state of perplexity, confusion, or bewilderment.
[From Latin nn pls, no more : nn, not; see non- + pls, more; see pel-1 in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition copyright ©2000 by Houghton Mifflin Company. Updated in 2003. Published by Houghton Mifflin Company. All rights reserved.