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• s  (chemistry, physics, biology) readily undergoing change or breakdown
• s  liable to change
  an emotionally labile person

• Faber's prose is an amazingly labile instrument, wry and funny, never pretentious, capable of rendering the muck of a London street and the delicate hummingbird flights of thought .
• It suggests that personality is labile, and this insight was part of Watteau's appeal to modern art ists.
• No one knew it at the time, of course, but flu viruses are notoriously unstable-- "genetically labile," as one researcher puts it.