Ant. Freshness, vigor, indefatigability, activity.
Fatigue, v. Harass, weary, tire, jade, exhaust, fag.
Ant. Inspirit, refresh, enliven, animate.
Fatuity. Foolishness, imbecility, idiocy; folly, madness, absurdity, infatuation.
Ant. Wisdom, sense, soundness, sobriety, discernment.
Fault. Defect, blemish, imperfection, flaw, weakness, failing, frailty; misdeed, misdemeanor, offense, trespass, wrong, transgression, delinquency, indiscretion; slip, error, lapse; failure, omission, want, drawback.
Ant. Perfection, sufficiency, correctness, completeness.
Faultless. Without blemish, perfect; innocent, guileless, blameless, sinless, spotless, immaculate, guiltless, stainless; complete, correct, accurate.
Ant. Incomplete, imperfect, incorrect, defective, inaccurate, corrupt, faulty, erroneous.
Faulty. Bad, defective, imperfect; blamable, blameworthy, culpable, reprehensible.