inapplicable

This term describes a lack of fit between a rule, law, or theory and a specific set of circumstances. It suggests a logical mismatch where the criteria of a general principle simply do not align with the unique characteristics of a particular case, rendering the principle useless for that instance.

While similar to irrelevant, inapplicable specifically implies a failure of application or execution. A piece of information might be irrelevant because it is trivial, but a regulation is inapplicable because it cannot be legally or logically enforced upon the subject in question.