Poker-faced

adj

Definitions

Adjective
  1. 1
    Wearing a poker face: studiously neutral in facial expression; giving nothing away.

    "John, in his most poker-faced manner, continued to explain the rules."

Adjective
  1. 1
    deliberately impassive in manner wordnet

Etymology

From the attitude necessary in the game of poker, since one is ill-advised to reveal delight at being dealt a winning hand lest other players decline to bet (or contrariwise, show disappointment at a poor hand if one is inclined to bluff).

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