a grey area
an ill-defined situation or field not readily conforming to a category or to an existing set of rules
In the 1960s, grey areas in British planning vocabulary referred to places that were not in as desperate a state as slums but which were in decline and in need of rebuilding.
2001 - Rough Guide to Travel Health - In theory, it should be a cinch to diagnose appendicitis, but in practice it's much more of a grey area.
a grey area :
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