Unemotional (adjective)

Not having or showing feelings; lacking emotion.

Origin:

Mid 19th century: from un- (expressing negation) + emotional, from french émotionnel.

Examples:

1. Her unemotional response to the news was surprising.
2. His unemotional demeanor gave no hint of his true feelings.
3. She remained unemotional even as others around her were crying.
4. The unemotional delivery of the speech was criticized for its lack of passion.
5. He had a reputation for being unemotional and detached in his personal relationships.