1. Lacking sense or discretion
   "his rattlebrained crackpot ideas"
   - rattlepated, scatterbrained, scatty [Brit]

See also: foolish

• chromatographically
• chromatography
• chromatography column
• chromatophore
• chrome
• chrome alum
• chrome green
• chrome red
• chrome yellow
• chrome-nickel steel
• chrome-tungsten steel
• chromesthesia
• chromic
• chromic acid
• chromite
• chromium
• chromium steel
• chromium-plate
• chromo
• chromoblastomycosis
• chromogen
• chromogenic
• chromolithograph
• chromolithography
• chromophore