flint

This term evokes a sense of extreme hardness and utility. In its literal sense, it refers to a specific mineral prized for its ability to create fire and its sharp edges when fractured, linking it to survival and prehistoric technology.

When applied to a person, the word carries a negative connotation of emotional rigidity. It describes someone who is impervious to pleas or empathy, suggesting a personality that is as cold and unyielding as the stone itself.