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dull of apprehension stresses
gen.	непонятный
obs.	медленно соображающий (В.И.Макаров); туповатый (Anglophile); непонятливый (The disciples seem to have been dull of apprehension in regard to the figurative language of our Lord. (1844) Anglophile); туго соображающий (By what process of reasoning do you convict him of mala fides? He may have been dull of apprehension; he may have been hard to be convinced ; but obtuseness of intellect is not to be regarded as only another name for want of veracity. (1819))

dull of apprehension: 2 phrases in 1 subject

Makarov

2