The phrase "true as steel" is often used to describe someone who is solid, reliable, and unwavering in their beliefs and actions. However, there are many other synonyms that can convey similar meanings. Some examples include "utterly dependable," "steadfast," "loyal," "trustworthy," "unfaltering," "unwavering," "consistent," "firm," "unyielding," and "resolute." Each of these words has its own unique nuances and connotations, but they all convey the idea of someone who is trustworthy and staunchly committed to their principles. Whether you're writing a poem, a novel, or a business memo, these synonyms can help you convey the qualities you want to express in a more nuanced and nuanced manner.