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closemouthed

[klohs-mouth d, -moutht]
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adjective
  1. reticent; uncommunicative.

Origin of closemouthed

First recorded in 1880–85; close + mouth + -ed3

Synonyms

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tight-lipped, diffident, taciturn, secretive.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018