However, you could use prefixes to create words that convey similar meanings to "unaware":
* Ignorant: "in-" (lack of) + "cognizant" (aware) = Incognizant
* Uninformed: "un-" (not) + "informed" (having knowledge) = Uninformed
* Unknowing: "un-" (not) + "knowing" (having knowledge) = Unknowing
* Oblivious: "ob-" (against, opposite) + "livious" (to know, understand) = Oblivious
You could also use prefixes to create words that describe the state of being unaware:
* Unsuspecting: "un-" (not) + "suspecting" (believing something is likely) = Unsuspecting
* Unprepared: "un-" (not) + "prepared" (ready for something) = Unprepared
* Unforeseeing: "un-" (not) + "foreseeing" (seeing something in advance) = Unforeseeing
Remember, the specific word you choose will depend on the context and the nuances of meaning you want to express.