Etymology
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expressionless (adj.)

1831, "giving no expression," from expression + -less. Shelley used it with a sense of "unexpressed" (1819).

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Definitions of expressionless

expressionless (adj.)
deliberately impassive in manner;
his face remained expressionless as the verdict was read
Synonyms: deadpan / impassive / poker-faced / unexpressive
From wordnet.princeton.edu