determined not to change your mind or to be persuaded about something (Oxford)
impossible to persuade, or unwilling to change an opinion or decision (Cambridge)
Eva was adamant that she would not come. (Oxford)
The government remained adamant that there was no more money available. (Oxford)
I've told her she should stay at home and rest but she's adamant that she's coming. (Cambridge)
looked abashed
felt abashed
appeared abashed
Intransigent
Uncompromising
Flexible
Indefinite
Adamantly