Use 'antithesis' to talk about two things that are completely opposite in nature or character. Silence is the antithesis of a roaring engine.
Pro Tip 2/3
Understanding Through Contrast
By highlighting the antithesis, you can deepen understanding of the original concept. War is the antithesis of peace.
Pro Tip 3/3
Emphasize Differences
Using 'antithesis' emphasizes the magnitude of difference between opposing ideas or things. His straightforward approach is the antithesis of his colleague's elusive tactics.