ad ‧ a ‧ mant /ˈædəmənt/ BrE AmE adjective
[ Date: 800-900 ; Language: Old French ; Origin: Latin adamas 'hardest metal, diamond' , from Greek ]
determined not to change your opinion or a decision that you have made:
She begged me to change my mind, but I remained adamant.
adamant that
Madonna is adamant that she will not tour this year.
—adamantly adverb :
Britain is adamantly opposed to the new directive.