1. Foolish; totally unsound
   - crazy, half-baked, screwball

See also: impractical

• Frenchman
• Frenchwoman
• frenetic
• frenetically
• frenulum
• frenum
• frenzied
• frenziedly
• frenzy
• freon
• frequence
• frequency
• frequency band
• frequency distribution
• frequency modulation
• frequency response
• frequency-response characteristic
• frequency-response curve
• frequent
• frequentation
• frequentative
• frequenter
• frequently
• fresco
• fresh