- s (chemistry, physics, biology) readily undergoing change or breakdown
- s liable to change
an emotionally labile person
- No one knew it at the time, of course, but flu viruses are notoriously unstable-- "genetically labile," as one researcher puts it.
- 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.