1She was undemonstrative about her feelings, but her actions spoke louder than words.
2Is he undemonstrative by nature, or is there something specific bothering him?
3The undemonstrative exterior of the building belies the vibrant art scene within.
4Try not to be undemonstrative when giving feedback; be clear and direct.
5There are cultural contexts in which being undemonstrative is seen as a sign of strength rather than weakness.