Which preposition to use with obtuse

as Occurrences 1%

The result no doubt of that 'muse' was the suspicion, or, perhaps, the conviction, that the rest of the world would, in all probability, be as obtuse as Ellwood; and to that suspicion or conviction we appear to owe Paradise Regained.

on Occurrences 1%

All the inconsistencies were embodied in that Judge, punctilious in manner, scrupulous in attire, conscientious in trivialities, and obtuse on great principles, fitly described by Charles O'Conor"A very ladylike Judge."

to Occurrences 1%

On the other hand, one may be drawn, through the love of moral beauty in creatures, of justice, and mercy, and liberality, and truthfulness, to the love of God as their archetype, and yet be perfectly obtuse to æsthetic beauty; and thus again we see that high æstheticism is compatible with low morality, and conversely.

Which preposition to use with  obtuse