UNDEMONSTRATIVE
Meaning of UNDEMONSTRATIVE in English
un ‧ de ‧ mon ‧ stra ‧ tive /ˌʌndɪˈmɒnstrətɪv $ -ˈmɑːn-/ BrE AmE adjective
not showing your feelings of love or friendliness
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012