Get the FREE one-click dictionary software for Windows
or the iPhone/iPad and Android apps
Adjective: nonplused  ,nón'plust
Usage: US (elsewhere: nonplussed)
  1. Filled with bewilderment
    "He stood nonplused by the unexpected turn of events";
    - at a loss, nonplussed, puzzled, perplexed, thrown

See also: perplexed