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What are the technical terms, in your field, for 'dunno'?
In astronomy there's 'unmodelled second order effects'
In medicine there's 'idoeopathic'
In archeology/anthropology there's 'ritual purposes'
How do you professionally term 'we haven't got a clue'?
@vidyasagar academia in general has 'merits further research' i believe, but in mathematics, things we can't prove we call postulates, though that's not quite the same as 'dunno'.