Enzyme inhibitors, reversible or irreversible?
These modes of inhibition are reversible. They describe a particular modification of the working of the enzyme (change of affinity, of maximum velocity, of both) due to the reversible binding of an inhibitor to a particular site.

On the other hand irreversible inhibition stops the enzyme from working through an inhibitor that binds irreversibly : no more transformation of substrate occurs after that. One cannot define a velocity, affinity, or IC50, for a non-working enzyme, thus "competitive", "non-competitive", "uncompetitive" are not useful concepts in that case.