Learner's definition of LIABLE
1 : legally responsible for something
— usually + for
If someone gets hurt on your property, you could be liable.
The amusement park was held liable in the boy's death. [=a court of law ruled that the amusement park was responsible for the boy's death]
2 [more liable; most liable] : likely to be affected or harmed by something — + to 3 [more liable; most liable] : likely to do something — + to
You're liable to fall if you're not more careful.
It's liable to rain before we're done.
That guy's liable to say anything. [=he might say anything]