Definition of "labile" [la•bile]

• Open to change; adaptable: an emotionally labile person. (adjective)
• Chemistry Constantly undergoing or likely to undergo change; unstable: a labile compound. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "I would, however, dispute the claim that he’s paranoid … and claiming that he’s emotionally labile is quite frankly laughable."
• "One is that the internal muscle has become very labile, meaning any little input inside the anus causes it to relax."
• "Lying on the table, stuck full of needles in a room painted soft peach, with monks softly chanting in the background, my mind wandered to the acupuncturist's use of the word "labile" in our pre-treatment conversation and the realization that labile and labial were not the same word."