1. Lacking sense or discretion
   - rattlebrained, rattlepated, scatty [Brit] 
2. Guided by whim and fancy
   - flighty, flyaway, head-in-the-clouds

See also: foolish, frivolous

• Pinsk
• pinstripe
• pinstriped
• pint
• pint-size
• pint-sized
• pintado
• pintail
• Pinter
• pintle
• pinto
• pinto bean
• Pinus
• Pinus albicaulis
• Pinus aristata
• Pinus attenuata
• Pinus banksiana
• Pinus californiarum
• Pinus cembra
• Pinus cembroides
• Pinus contorta
• Pinus contorta murrayana
• Pinus densiflora
• Pinus echinata
• Pinus edulis