closemouthed

listen to the pronunciation of closemouthed
İngilizce - Türkçe
ağzı sıkı
konuşmaz
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İngilizce - İngilizce
reticent, secretive or uncommunicative

Instructors were notoriously closemouthed about their gunnery techniques.

Cautious in speaking; secret; wary; uncommunicative
{s} silent, quiet, reserved, not talkative