Etymology
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labile (adj.)

mid-15c., "prone to lapse," from Latin labilis, from labi "to slip" (see lapse (n.)). Hence, in chemistry, "prone to undergo displacement" (c. 1600).

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Definitions of labile

labile (adj.)
(chemistry, physics, biology) readily undergoing change or breakdown;
labile (adj.)
liable to change;
an emotionally labile person
From wordnet.princeton.edu