antithesis
US /ænˈtɪθ.ə.sɪs/
UK /ænˈtɪθ.ə.sɪs/

1.
antítesis, opuesto
a person or thing that is in direct opposition to or contrast with another
:
•
Love is the antithesis of hatred.
El amor es la antítesis del odio.
•
His calm demeanor was the antithesis of her frantic energy.
Su actitud tranquila era la antítesis de su energía frenética.