furtive

a.鬼鬼崇崇的，偷偷摸摸的

furious, furiously, furl, furlong, furlough, furnace, furnish, furnishings, furniture, furor, furore, furrier, furrow, furry, further, further education, furtherance, furthermore, furthermost, furthest, furtively, furtiveness, fury, furze, fuse, fuse wire, fuse-box, fuselage, fusible, fusilier, fusillade, fusion, fuss, fussily, fussiness, fusspot, fussy, fustian, fustiness, fusty,