closemouthed

[ klohs-mouthd, -moutht ]
/ ˈkloʊsˈmaʊðd, -ˈmaʊθt /

adjective

reticent; uncommunicative.

Origin of closemouthed

First recorded in 1880–85; close + mouth + -ed3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019