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

• soldering iron
• soldier
• soldier grainy club
• soldier of fortune
• soldier on
• soldierfish
• soldiering
• soldierlike
• soldierly
• Soldiers of God
• soldiership
• soldiery
• soldo
• sole
• Solea
• Solea lascaris
• Solea solea
• solecism
• soled
• Soledad
• soledad pine
• Soleidae
• Soleirolia
• Soleirolia soleirolii
• soleless