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медленно соображающий stresses
gen.	heavy of thought; sluggish (Aly19); lead-footed; slow-witted; lead footed; slow witted
obs.	dull of apprehension (В.И.Макаров)
медленно соображать
gen.	be slow on the uptake (Anglophile); be slow in the uptake; be slow in the uptake; be slow to grasp
Gruzovik, inf.	be slow to grasp
Makarov.	slow in the uptake

медленно соображающий: 8 phrases in 3 subjects

General	6
Informal	1
Makarov	1