an 'infernally' [='extremely'] difficult problem
Stop making that 'infernal' racket!
the 'infernal' regions of the dead
(..) What line of work are you in, Mr Button? -Buttons. Button's Buttons. There isn't a button we don't make. Our biggest competition is B.F. Goodrich and his infernal zippers. Would you gentlemen like anything else? One for the road, Benjamin? Only if you let me pay for it, Mr Button. (..)2008 The Curious Case of Benjamin Button