Read this: Articles 46–53 of the Vienna Convention on the Law of Treaties set out the only ways that treaties can be invalidated—considered unenforceable and void under international law. A treaty will be invalidated due to either the circumstances by which a state party joined the treaty, or due to the content of the treaty itself. Invalidation is separate from withdrawal, suspension, or termination (addressed above), which all involve an alteration in the consent of the parties of a previously valid treaty rather than the invalidation of that consent in the first place.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): Which articles of the Vienna Convention on the Law of Treaties set out the ways that treaties can be invalidated?
Articles 46–53