Easily altered or changed; unstable. The patient's labile mood made it difficult for the doctors to assess his mental state accurately.
Prone to change or fluctuate, especially in a chemical or physical context. The labile nature of the compound requires it to be stored under specific conditions to prevent decomposition.
Displaying wide or unpredictable variation in physiological or psychological measurements; characterized by rapid fluctuations. Patients with labile blood pressure require careful monitoring during surgery.