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

• Red Notice
• red oak
• red onion
• red osier
• red osier dogwood
• red panda
• red pepper
• red periwinkle
• red phalarope
• red pimpernel
• red pine
• Red Planet
• red porgy
• red raspberry
• red rat snake
• red region
• red ribbon
• Red River
• red rockfish
• red salmon
• red sandalwood
• red sanders
• red sanderswood
• red saunders
• red scare