Inexorable
Part of speech: adjective
Definition: Unable to be persuaded; relentless; unrelenting Impossible to stop or prevent; inevitable Adamant; severe
Example sentence: Our inexorable destiny is to be a great nation.
Adamant
Part of speech: adjective
Definition: resistant to reason; determined; inflexible; unshakeable; unyielding
Part of speech: noun
Definition: a rock or mineral held by some to be of impenetrable hardness; a name given to the diamond and other substances of extreme hardnessan embodiment of impregnable hardnesslodestone; magnet