Treaty
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.
Which processes simply alter the consent given by parties to a previously valid treaty rather than invalidating the consent completely?
withdrawal, suspension, or termination
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.
Treaty