diametrically opposed

Completely at odds

Diametrically opposed describes things that are as different or contrary as possible, like points at opposite ends of a diameter.

The phrase emphasizes complete opposition rather than mere disagreement: Their views on immigration are diametrically opposed.

It applies to opinions, positions, interests, or philosophies that cannot be reconciled because they stand at absolute extremes from each other.

Related

worlds apart · dichotomous · counterpoints · contradictory · chalk and cheese · antagonistic · mutually exclusive · conflicting · dualistic · irreconcilable · poles apart · black and white · binary · negating · inverse · contrasting · apples and oranges · paradoxical

Opposites
degree of opposition/difference

diametrically opposedidentical

Exactly the same

the same · indistinguishable · equivalent · one and the same · interchangeable

agreement/alignment

diametrically opposedidentical

Exactly the same

of one mind · in harmony · in agreement · in sync · on the same page

Family

diameter, diametric, diametrical, diametrically, oppose, opposed, opposing, opposition, opponent

Familiarity
Top 200,000
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G