devilish
Very: an epithet which in the English vulgar language is made to agree with every quality or thing; as, devilish bad, devilish good; devilish sick, devilish well; devilish sweet, devilish sour; devilish hot, devilish cold, &c. &c.
–From the 1811 Dictionary of the Vulgar Tongue.
“He is devilish handsome.” Makes you just want to shove that -ly on the end, doesn’t it? 
