What is the meaning of the word “antithesis in the following sentence: “that kind of world is the very antithesis of the so-called ‘new order’ of tyranny which the dictators seek to create with the crash of a bomb”?

“what i heard was abominable,” said utterson. “it can make no change. you do not understand my position,” returned the doctor, with a certain incoherency of manner. “i am painfully situated, utterson; my position is a very strange—a very strange one. it is one of those affairs that cannot be mended by talking.” –the strange case of dr. jekyll and mr. hyde, robert louis stevenson write two to three sentences explaining how this passage creates suspense.