[ley-buhl, -bahyl]
apt or likely to change.
Chemistry. (of a compound) capable of changing state or becoming inactive when subjected to heat or radiation.

1400–50; late Middle English labyl < Late Latin lābilis, equivalent to Latin lāb(ī) to slip + -ilis -ile

lability [luh-bil-i-tee, ley-] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
labile (ˈleɪbɪl)
1.  chem (of a compound) prone to chemical change
2.  liable to change or move
[C15: via Late Latin lābilis, from Latin lābī to slide, slip]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

labile la·bile (lā'bīl', -bəl)
Constantly undergoing or likely to undergo change; unstable.

la·bil'i·ty (-bĭl'ĭ-tē) n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
But then you see them as they're older, and they're off in college and not having these labile mood swings anymore.
Brilliant originals come in two kinds: emotionally stable and emotionally extremely labile.
People with labile boundaries need external controls, and legal consequences can offer one kind of useful control.
Emotionally labile patients should avoid stimulants, as they exacerbate mood shifting.
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