Related Clues:

• Hit-or-miss
• Not at all consistent
• Undependable
• Sporadic
• Deviating off course
• Spotty
• Aberrant
• Lacking consistency
• Changeable
• Rambling
• All over the map
• Shifting, unpredictable
• Inconsistent, shifting
• Shifting like Cartier
• Liable to unpredictable change