Related Clues:

• Changeable or inconstant
• Liable to change, fickle
• Open to change, adaptable - i.e. ball
• The French having bad temper may become unstable
• Crompton's making out the bill that's unsettled
• Opposed to agricultural land in which 'i' is used for 'x'?
• Changeable, so changeable, very changeable
• Chemically unstable
• Likely to change
• Algebraic uncertainty
• (Chemically) unstable
• Subject to change; fickle
• With no fixed pattern
• Prone to change
• Bill carried by beast of burden - that's subject to change