Ainda não temos significados para "so case-hardened".
1My constitution is so case-hardened that I believe I could live all the year at Spitzbergen.
2Italy, through this portal, was capable of casting a spell even upon a traveller so case-hardened as Smollett.
3"Never in all my experience have I known a soul so case-hardened as yours," he said in a low tone.