Word of the Week: adamantine (ăd-ə-MĂN-tēn) Definition (Adjective) That cannot be easily overcome or defeated; rigid, unyielding; unwavering, immovable; (now especially) refusing to be persuaded or to change one's mind. In Context "Contrary to popular impression, the real art of colonial government was not an adamantine rigidity but a machiavellian flexibility in the perpetual search for collaborators." Robert Holland, Editor, Emergencies and Disorder in the European Empires after 1945, 1994.