The phrase "kept countenance" is often used to describe someone maintaining a calm and composed expression, even in difficult or challenging circumstances. While this phrase can be useful in certain contexts, there are several synonyms that can be used interchangeably. These include "maintained composure," "remained stoic," "held one's poise," and "kept a straight face." Each of these phrases conveys a similar sense of control and discipline in the face of adversity, and can be easily substituted for "kept countenance" in many contexts. By using these synonyms, speakers and writers can help to add variety and nuance to their language, while still conveying the same basic idea.