Definition of: Antithesis
Antithesis means the total opposite of something or someone, for example, the Moon and Sun, the Moon and the Sun are on opposite sides of Earth and the Sun is bright and hot but the moon is dark and cool.when the sun is up most people are awake but when its night and moon is in the sky most people are sleeping in bed by 9pm.
Another Example would be God and the Devil
God is meant to be the light and lives above in the sky and is the creator of life. But the Devil is meant to be the dark side and the end of all life.
Some example off google
In Julius Caesar by William Shakespeare, Marcus Brutus and Mark Antony were painted in opposite colors. Interestingly, the contrast isn't stark. Shakespeare takes a more subtle approach to antithesis here, portraying Brutus as an honorable - yet slightly naive - man. Antony, too, was an honorable man, but he possessed a certain ruthlessness and ambition that Brutus was lacking.

