"Iron people" can be described using a variety of synonyms. One term that can be used is "resolute individuals," which highlights their unwavering determination and strength. Another option is "toughened individuals," emphasizing their endurance and ability to withstand challenges. "Rugged individuals" conveys a sense of roughness and toughness, while "hardy individuals" suggests they are able to thrive in difficult conditions. "Strong-willed individuals" speaks to their persistence and determination, while "unyielding individuals" emphasizes their steadfastness. Ultimately, there are many different ways to describe "iron people," all of which capture their resilience and strength.