adamantly
adv. manner B2 Upper Intermediate US //ˈædəməntɫi// UK //ˈædəməntli// adamant·ly
adv. in a way that shows you are very determined and will not change your mind. You use this when someone is being very firm about what they want or believe.
adv. in a firm and determined manner; showing a refusal to change one's opinion or course of action. Often used to modify verbs of assertion or verbs related to resistance.
From adamant + -ly.