Untrembling is often used to describe someone who is calm and composed, showing no signs of fear or anxiety. There are several synonyms for this term that can be used interchangeably, depending on the context in which the word is used. One common synonym for untrembling is unflinching, which suggests a person who does not back down or falter in the face of danger or adversity. Another synonym is unshaken, which implies a steadfastness and unwavering resolve in the face of challenges. Similarly, unwavering is another word that is often used to describe someone who is untrembling, displaying an unshakable belief in their convictions or actions. Other synonyms for untrembling include resolute, firm, and steadfast, all of which suggest a sense of certainty and determination in the face of difficulty. Ultimately, the choice of synonym will depend on the specific context and tone of the language being used.