inexorable

The Latin antecedent of inexorable is inexorabilis, which is itself a combination of the prefix in-, meaning "not," plus exorabilis, meaning pliant or "capable of being moved by entreaty." It's a fitting etymology for inexorable. You can beseech and implore until you're blue in the face, but that won't have any effect on something that's inexorable. Inexorable has been a part of the English language since the 1500s. Originally, it was often applied to persons, or sometimes to personified things ("deaf and inexorable laws"). These days, it is usually applied to things, as in "inexorable monotony" or "an inexorable trend." In such cases, it essentially means "unyielding" or "inflexible."