adamant
/ˈædəmənt; `ædəˌmənt/ adj
(esp of a person or his manner) firmly or stubbornly determined; unwilling to be persuaded （尤指人或态度）坚决的, 坚强的, 倔强的, 坚定不移的
an adamant refusal 断然拒绝
She was quite adamant that she would not come. 她坚决不来.
On this point I am adamant, ie my decision will not change. 在这一点上我是坚定不移的.