Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
This is why he was able to slice through Smoker, He could harden his body to the point that he could resist Luffy's Jet Gatling.
Source: https://gamerant.com/one-piece-strongest-busoshoku-haki-users-ranked/