Stony-faced is a phrase used to describe someone who appears unemotionally cold or expressionless. However, there are several other similar synonyms that can be used to describe this personality trait. Some of these synonyms include unmoved, impassive, stoic, poker-faced, blank, unresponsive, and unflappable. Each of these words suggests a person who is emotionally detached, which might be because of their personality or experience. A stony-faced individual might have a hard time expressing their thoughts and opinions to others. They might also be perceived as aloof or distant due to their lack of emotional display. However, some people embrace a stony-faced personality as a way of being rational and detached in their interactions with others.