Synonyms:
* Responsible: This emphasizes the duty or obligation to answer for something.
* Accountable: Similar to responsible, suggesting a need to justify actions.
* Susceptible: This focuses on the likelihood of being affected by something.
* Prone: Similar to susceptible, implying a tendency towards something.
* Vulnerable: Highlights a weakness or exposure to harm.
* Subject to: This is a more formal way of saying "liable to".
Antonyms:
* Immune: This means protected from something.
* Insusceptible: The opposite of susceptible, meaning not easily affected.
* Protected: This suggests being shielded from harm.
* Safe: Indicates a lack of danger or risk.
* Exempt: This means being specifically excluded from something.
The best synonym or antonym will depend on the specific context in which "liable" is used.