"Terrifyingly beautiful": I have heard it said, parri, meaning bella da morire. I wouldn't normally use the adjective beautiful to describe a man (although in some cases it's possible)che ne pensate di "terryfingly" beautiful, nice, etc?
Sarebbe letteralmente: "simpatico, bello, da far paura"
Send us a piccie and I'll tell you!'Awfully good-looking/handsome' sound the most natural to me.
Not referring to me by any chance were you, Jo?!!!