Related Clues:

• Subject to change
• Uneven
• Inconstant
• Volatile
• Fluctuating
• Uneven in quality
• Poor, as coverage
• Hit-or-miss
• Uneven, as a performance
• Not at all consistent
• Intermittent
• X or Y, in algebra
• Undependable
• Sporadic
• Deviating off course