The phrase "rarely aware of" is grammatically correct and can be used in written English.
It is typically used to describe someone who is not often or frequently conscious of something. Example: "He was rarely aware of the impact of his words on others, often unintentionally offending those around him."
Patients are rarely aware of this.
They are rarely aware of, nor can they assert, their sexual and reproductive health rights.
The readers of modern encyclopaedias are rarely aware of the numerous aids that have been provided to make their search for information so easy and efficient.
My mind is usually so full of what's been happening on stage that I'm rarely aware of my surroundings at intermission, even in the men's room.
International visitors are rarely aware of how important surfing is in modern Peruvian culture – another reason that a visit to Kon-Tiki can add colour to a trip.
As for sound mixing, many viewers (including myself) are rarely aware of its contribution to a film, but one scene from 2010 has been the subject of discussion among friends precisely for its sonic blend: the night club scene in "The Social Network," in which Sean Parker Justin Timberlakee) tells Mark Zuckerberg Jesse Eisenbergg) about Victoria's Secret and its founder.
He rarely is aware of how tiresome he is and how he makes other people weary.
I rarely am aware of the artistry of landscape design, and it's nice to sit there and think about that".
Patients newly enrolled in a deductible plan had limited knowledge of having any deductible, including rarely being aware of which services are deductible-exempt.
Even when workers developed occupational diseases, particularly long-delayed conditions such as occupational cancer and pneumoconioses, they rarely became aware of their work as the cause of their disability.
According to sense-datum theorists, however, we are rarely, if ever, aware of this indirection in ordinary (veridical) exteroception.
