adamant
adj.adj. refusing to change your mind about something. You use this when someone is very firm and certain about their decision.
adj. refusing to be persuaded or to change one's mind. Often used predicatively after linking verbs like 'be' or 'remain'.
She was adamant that she would not attend the meeting.
Despite several lucrative offers from competitors, the founder remained adamant about keeping the company independent.
The prime minister was adamant in his refusal to negotiate with the rebels, maintaining that any concession would undermine the rule of law.
From Middle English adamant, adamaunt, from Latin adamantem, accusative singular form of adamās (“hard as steel”), from Ancient Greek ἀδάμας (adámas, “invincible”), from ἀ- (a-, “not”) + δαμάζω (damázō, “I tame”) or of Semitic origin. Doublet of diamond.
Often followed by a 'that' clause or the preposition 'about'.
He was adamant to goHe was adamant about goingLearners often use an infinitive after 'adamant', but it typically takes 'about' followed by a gerund or a 'that' clause.