The phrase "absolutely basic" is correct and usable in written English.
You can use it to emphasize that something is fundamental or essential, often in a context where simplicity or foundational knowledge is being discussed.
Example: "Before we dive into advanced topics, let's ensure everyone understands the absolutely basic concepts of the subject."
Alternatives: "fundamentally simple" or "utterly essential".
"No terrorist group should interfere with a child's right to get something that is so absolutely basic to their future.
One of the main things was the loss of common sense, which sounds quite trivial but is actually absolutely basic and it just gets worse.
"It's a beautiful book but also touches on something absolutely basic and profound - the need and yearning a child feels for parenting".
It was right to stop abuse of the benefits system … but freedom of movement, albeit constrained as it is under the European agreements, is an absolutely basic principle and a lot of British people take advantage of it".
Miro, for instance, was a country boy to whose imagery the folk culture of Catalonia, with its obsessive concentration on shit as a rural sacrament, was absolutely basic; such meanings were not at all obvious when seen from Paris or New York.
I recognise that those who make their moral decisions simply on the basis of assessing consequences don't accept this distinction, but for Christian moral theology, it is absolutely basic, as it has become basic to good medical practice and proper military conduct.
In her influential 1951 manifesto, "Theater-in-the-Round," Margo Jones, one of the pioneers of regional theater, argued that a permanent company was one of her four "absolutely inflexible basic policies," along with complete professionalism, at least three weeks of rehearsal time and an emphasis on new plays as well as classics.
"I think it is an absolutely fundamental basic philosophical distinction — that distinction between needs and desires.
Talking animals, for example, are fine with me, and I thought the screeching gulls in "Finding Nemo" who called "Mine, mine!" absolutely nailed the basic personality of the seabirds.
"It's up to us as a team to use that support and that noise to drive us on, while it will be down to the individuals to maintain their composure in the heat of battle to ensure that we get the basics absolutely right in this high-pressured environment".
Most notable was new language recommending that emergency contraception is provided for women who have been raped, an absolutely vital and humane basic service.
