1. Capable of being challenged

See also: challenge, contestable

• frigidly
• frigidness
• frigorific
• frijol
• frijole
• frijoles refritos
• frijolillo
• frijolito
• frill
• frilled
• frilled lizard
• frilly
• Frimaire
• fringe
• fringe benefit
• fringe bush
• fringe cups
• fringe tree
• fringe-toed lizard
• fringed
• fringed gecko
• fringed gentian
• fringed grass of Parnassus
• fringed loosestrife
• fringed orchid