1. 热心地：fervent 热的 | fervently 热心地 | fervid 热的

2. 坚信最後会取得胜利：621ferventa. 热的,炎热的,热心的 | 622fervently坚信最後会取得胜利. | 623festivea. 庆祝的,喜庆的,欢乐的

3. 热情地：consequently 所以,因此 | fervently 热情地 | faintly 微微地

4. 诚心的：bright light 强光 | fervently诚心的 | battered 磨损的

adv

1. with passionate fervor

e.g. both those for and against are fervently convinced they speak for the great majority of the people
a fierily opinionated book

Synonym: fierilyfervidly