English version

close-mouthed

From Longman Dictionary of Contemporary Englishclose-mouthedclose-mouthed /ˌkləʊs ˈmaʊðd◂, -ˈmaʊθt◂ $ ˌkloʊs-/ (also closed mouthed /ˌkləʊzd- $ ˌkloʊzd-/ American English) adjective  TALK TO somebodynot willing to say much because you are trying to keep a secret syn tight-lipped
Examples from the Corpus
close-mouthedEmma suspected some of the other children had harassed her, but even to Emma, Ruth had been close-mouthed.
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