Undemonstrative (adjective)

Not expressive or showing feelings or emotions.

Origin:

Late 17th century, from un- + demonstrative.

Examples:

1. The undemonstrative man was difficult to read, and never showed any strong emotions.
2. The undemonstrative woman was reserved and kept to herself.
3. The undemonstrative child rarely smiled or laughed.
4. The undemonstrative performance was criticized for lacking energy and excitement.
5. The undemonstrative demeanor made it hard for others to connect with the person.