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

• Equisetum fluviatile
• Equisetum hyemale
• Equisetum hyemale robustum
• Equisetum palustre
• Equisetum robustum
• Equisetum Sylvaticum
• Equisetum variegatum
• equitable
• equitably
• equitant
• equitation
• equity
• equity credit line
• equivalence
• equivalent
• equivalent weight
• equivalent word
• equivalent-binary-digit factor
• equivalently
• equivocal
• equivocally
• equivocalness
• equivocate
• equivocation
• equivocator