unprefixal
/ʌnˈprɛfɪksəl/Definitions
1. adjective
Not formed by adding a prefix to a word.
“The term ‘unprefixal’ is itself an unprefixal word, which can be confusing for some learners.”
2. noun
A word that is not formed by adding a prefix to another word.
“In the English language, unprefixal words like ‘unprefixal’ itself are relatively rare and often create confusion.”