【英語諺語】False friends are worse than bitter enemies. 明槍易躲，暗箭難防。
【英語諺語】Far from eye, far from heart. 眼不見，心不煩。
【英語諺語】Far water does not put out near fire. 遠水救不了近火。
【英語諺語】Faults are thick where love is thin. 一朝情意淡，樣樣不順眼。
【英語諺語】Fear always springs from ignorance. 恐懼源於無知。
【英語諺語】Fields have eyes, and woods have ears. 隔牆有耳。
【英語諺語】Fire and water have no mercy. 水火無情。
【英語諺語】Fire is a good servant but a bad master. 火是一把雙刃劍。
【英語諺語】First come, first served. 先來後到。
【英語諺語】First impressions are half the battle. 初次見面，印象最深。
【英語諺語】First think and then speak. 先想後說。
【英語諺語】Fools grow without watering. 朽木不可雕。
【英語諺語】Fools has fortune. 呆人有呆福。
【英語諺語】Fools learn nothing from wise men, but wise men learn much from fools. 愚者不學無術，智者不恥下問。