The phrase "are diametrically different" is correct and usable in written English.
It can be used to describe two things that are completely opposite or fundamentally different from each other.
Example: "The two proposals are diametrically different, making it difficult to choose one over the other."
Alternatives: "are completely opposite" or "are fundamentally different".
The two worlds are diametrically different.
"The criteria today, clinically and histopathologically, are diametrically different from those 30 years ago," he said.
"Unless the facts are diametrically different, there is no risk from this loss to depositors or to taxpayers," he said.
The two eras are diametrically different in most respects.
Their politics are diametrically different -- Bachmann, who left Congress in 2014, was one of the most controversial conservatives in the House but they shared, as Bachman put it, the burden of being a woman running for office.
Talking to the media, she argued for the benefits of "love between two people who are diametrically different", claiming that their relationship allowed for a "perfect see-saw love".
The distinct bands on males shifted between yellow and red (dorsal) and between orange and black (lateral) within seconds, and the resulting colour pattern was diametrically different depending on whether males were in courtship or aggressive interactions.
Ms. Davis says Mar-a-Lago, with its glittery social scene and endless stream of Bentleys and Rolls Royces, is the world that the president understands best and in which he is most comfortable, but is "diametrically different" from the world of official Washington.
In Berlin and North Rhine-Westphalia and all of the other states, the results were diametrically different from that of the AfD, for which "immigration/refugees" served as the most influential factor (Infratest dimap 2013-2017).
Everything about them is diametrically different to the legions of men-in-T-shirts playing "Pulse X" to warehouses full of students every weekend.
