Daily contact with vice obtunds their first abhorrence of it.
"Plain Facts for Old and Young" by John Harvey Kellogg
Madeira did not seem to be unconscious, but his senses were obtunded, and it was some minutes before he could sit up.
"Sally of Missouri" by R. E. Young
In men of genius the moral sense is sometimes obtunded, if not altogether absent.
"Religion and Lust" by James Weir