The two notions are not specific to ZK, so it is in fact better to try to understand it in the context of general proof systems.
Soundness: the proof system is truthful, so whatever it proves, it is true.
Completeness: the proof system is comprehensive, so it can prove all true statements.
You can have completeness without soundness: if the proof system proves everything including falsity, obviously it is complete but not sound.
You can have soundness without completeness: if the proof system proves nothing, obviously it is sound (after all, it never proves any falsity), but not complete.
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