When it comes to expressing firmness and unwavering determination, the phrase "be adamant" is often used. But there are also plenty of synonyms for this phrase. For example, some might say to "stand firm," "stay resolute," or to "refuse to budge." Others might use the phrase "stay the course" or "stick to one's guns." These terms all convey the idea that someone is determined to hold their ground and will not be swayed by outside influence. Whether you use the phrase "be adamant" or opt for one of its synonyms, each has a powerful impact on those around them, showing that they will not be easily moved.