enthusiastic(with zealous fervor; excited, motivated) adjective [UK: ɪn.ˌθjuː.zɪ.ˈæ.stɪk] [US: en.ˌθuː.zi.ˈæ.stɪk]John is very enthusiastic. = John är väldigt entusiastisk.
zealous(full of zeal; ardent) adjective [UK: ˈze.ləs] [US: ˈze.ləs]
överentusiastisk [~t ~a] adjektiv
overzealous(too zealous; too enthusiastic or fervent) adjective [UK: ˌəʊv.ə.ˈze.ləs] [US: ˌoʊv.ə.ˈze.ləs]