buttoned up

Translations
скрытный, замкнутый
He is always so buttoned up, never sharing his feelings.
Он всегда такой скрытный, никогда не делится своими чувствами.
Definitions
Well-organized, neat, or completed; also used to describe someone who is very formal, reserved, or conservative in behavior or appearance.
Words
buttoned

adjective
застёгнутый
up

adverb
полностью