ardent(full of ardour) adjective [UK: ˈɑːdnt] [US: ˈɑːr.dənt]
fervent(exhibiting particular enthusiasm, zeal, conviction, persistence, or belief) adjective [UK: ˈfɜː.vənt] [US: ˈfɝː.vənt]His tone became more and more fervent. = Su tono se fue haciendo cada vez más ferviente.
zealous(full of zeal; ardent) adjective [UK: ˈze.ləs] [US: ˈze.ləs]
fervientemente adverb
fervently(in a fervent manner) adverb [UK: ˈfɜː.vənt.li] [US: ˈfɝː.vənt.li]