Lacking knowledge; ignorant.
Late Middle English: from Latin nescient- ‘not knowing’, from the verb nescire, from ne- ‘not’ + scire ‘know’.
“He’s a nescient being and it makes him insecure.”
Nothingburger (noun) (Chiefly US)
A person or thing of no importance, value, or substance. Now esp.: something which, contrary to expectations, turns out to be insignificant or unremarkable.
1950s: from nothing and burger. Added to the OED October 2018.