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не по существу stresses
gen.	non-substantive (non-substantive negotiations Stas-Soleil); be beside the point; beyond the mark; beside the mark; beside the question; far from the mark; off the point; externally
dipl.	away from the point (bigmaxus); wide off the mark (bigmaxus)
inf.	off the mark (Franka_LV)
Makarov.	from the point; beside the point; far beside the mark; far short of the mark; far wide of the mark; afield (вопроса, темы); away the point; short of the mark; wide of the mark

не по существу: 48 phrases in 9 subjects

Advertising	2
Economy	1
General	13
Latin	1
Law	7
Makarov	9
Medical	11
Military	3
Scientific	1