KEY: Uncertainty, [See CERTAIN].

• Fatuity
• Fatuous, [See FATUITY]
• Fault
• faulter
• Faultless
• Faulty, [See FAULT]
• Favor
• Favorable
• Favoritism
• Fawn_upon
• Fealty, [See FIDELITY]
• Fear
• Fearful
• Fearless, [See COURAGEOUS]
• Feasible
• Featly, [See FEAT]
• Feat, [See ACHIEVEMENT]
• Feature
• Federation, [See CONFEDERACY]
• Feeble
• Feeling
• Feign, [See PRETEND]
• Feint, [See FEIGN]
• Felicitate, [See CONGRATULATE]
• Felicitous