The phrase "a direct opposite" is correct and usable in written English.
It can be used when describing something that is completely contrary or in opposition to another thing.
Example: "In the debate, she argued that love is a direct opposite of hate."
Alternatives: "a complete opposite" or "an absolute contrary".
On the back cover of the book is a striking self-portrait of Steichen as a young man, with a thick shock of black hair, clean-shaven and with a piercing look in his eyes, a direct opposite of the long-bearded patriarch of his later years.
"In footballing terms, Alex Ferguson's Manchester United team of the late 1990s are a direct opposite to Mourinho's Chelsea.
I think that it is much more of a theological question that he is a guy who understands the world through liberation theology, which is oppressor and victim....That is a direct opposite of what the gospel is talking about...It's Marxism disguised as religion.
After prolonged discussion Antander thought p185 it necessary to surrender the city, since he was unmanly33 by nature and of a disposition the direct opposite of the boldness and energy of his brother; but Erymnon the Aetolian, who had been set up by Agathocles as co-ruler with his brother, expressing the contrary opinion persuaded all of them to hold out until they should hear the truth.
Proton came up with a product that is the direct opposite of a fuel cell, which converts hydrogen to electric current and water.
In the other, Universal Standard promoted its new loungewear with a full-color image that is almost the direct opposite — a size 24 woman in her white skivvies, generous rolls of flesh exposed to harsh lighting and the camera's glare.
The result, for the reader, isn't always catharsis, as Aristotle suggested, but its direct opposite: a sort of creeping horror that leads to a desensitisation to the reality being represented.
As I got my bearings, I realised I'd somehow managed to walk into a corner on the direct opposite side of the room from the ticket booth and door leading to the coat check.
Thus although NADPH and ATP generation are linked at the top and bottom of their related pathways in the red cell, the dynamic response to an ATP load however will not be the direct opposite of a load on NADPH because the response times of enzymes in the different pathways differ significantly.
In a way, it's the direct opposite of scoring for films.
What the water board is proposing is the direct opposite of a water grab.
