I think the phrases: "the behaviour is unspecified"; or "the behaviour is implementation dependant" are more appropriate.

Not being a native English speaker I wonder - what's the difference between "unspecified" and "undefined" in that context? "undefined" means there are no specs. "unspecified" means there are no specs. What is it?

Shouldn't that be "the behavior is unpredictable" since predicting means foretelling something that will have happened at a later point in time?

Frankly, that's finickiness. What's that talking of "behavior" concerning computers, anyways? There's no such thing. Computers don't "behave", since they don't choose one reaction or another out of a set of possibilities at free (or bound) will, pondering the effect of that choice. Talking of "behavior" when it comes to computers is an anthropomorphism, an analogy, a metaphor - one of those, I'm not sure which, but I guess the first is most accurate. But being such, any adjective (or adjectival component?) to express what is meant, is fine IMHO - as long as it is understood.

In reply to Re^2: The behavior is [sic] undefined by shmem
in thread The behavior is [sic] undefined by John M. Dlugosz

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