ferocious

adj.凶猛的，野蛮的

female, feminine, femininity, feminism, feminist, femme fatale, femoral, femur, fen, fence, fencer, fencing, fend, fender, fennel, feral, ferment, fermentation, fern, ferny, ferociously, ferocity, ferret, Ferris wheel, ferroconcrete, ferrous, ferrule, ferry, ferry-boat, ferryboat, ferryman, fertile, fertility, fertilization, fertilisation, fertilize, fertilize, fertilise, fertilizer, fertilizer, fertiliser, fervent, fervently,