*Antichrist means one who denies or opposes Christ. A great antagonist expected to fill the world with wickedness but to be conquered forever by Christ at His second coming.
The ultimate enemy of Christ*.
King James Bible references:-
[1 John chapter 2 verse 18]
Little children, it is the last time: and as ye have heard that antichrist shall come, even now are there many antichrists; whereby we know that it is the last time.
[1 John chapter 2 verse 22]
Who is a liar but he who denies that Jesus is the Christ? He is antichrist who denies the Father and the Son.
Britannica/Merriam-Webster