the mind > will > decision > irresolution or vacillation > reversal of or forsaking one's will or purpose > [adjective] > liable to (3)
figurative. Of persons: Slippery, unreliable; apt to fall or transgress. Obsolete.
Of a disease, symptom, or condition: recurring. Also of a person, etc.: relapsing, reoffending.
Liable to fall back or relapse; esp. tending to relapse into crime; reoffending.