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Use "closemouthed" in a sentence
"Though Declan had become an expert at torture, the immortals were astonishingly closemouthed, even withholding information about their natural enemies."
"They were both very closemouthed about their studies together as such things are private."
"From the moment she entered the building on Twenty-third and E that brisk December morning, everyone had been very formal and closemouthed."