ferviente, fervent, ardent.
feudalismo, m., feudalism.
fiar, to trust.
ficción, f., fiction, invention.
fiel, loyal, faithful.
fiera, f., (wild) beast.
fiesta, f., fun, festivity, festival.
figura, f., figure, shape, form, face.
figurar, to figure, imagine.
fijamente, firmly, attentively.