Context clues: Labile is used as an adjective to describe disposition.
Then, "...his mood would suddenly turn from joy to despondency"
Mood is another Word for disposition.
Then, "...I never knew when..." e.g. unpredictable, easily changeable
Then, "...caused me to be constantly on my guard..."
These give descriptive context clues.
Definition of labile: Likely to change easily; this unpredictability usually refers to mood.
Example: I had such a labile personality that I could go from sadness to anger in 30 seconds.
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