There are several synonyms for "such that one cannot walk all over." Some possibilities include "formidable," "unyielding," "unbending," "inflexible," and "unmovable." These words convey a sense of strength and solidity that cannot be easily overcome or toppled. In addition, other words such as "resolute," "steadfast," and "determined" imply a sense of determination and willpower that cannot be easily undermined or weakened. Whether describing a physical object or a person's resolve, these synonyms all convey a sense of something that is not easily defeated or overcome.