Lacking knowledge, ignorant naive or foolish.(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "unknowledgeable" in a sentence
"We do not consider ourselves naive or unknowledgeable, and appreciate that some domains are being used for other things than websites: email for example, and again we appreciate that you may simply not want to sell your domain."
"They're old-fashioned and blah blah blah, which is totally unknowledgeable, right?"
"Equally unfortunate are the endless streams of unknowledgeable consumers that seem to want to compensate for their lack of knowlege by buying guns from egomaniacs, just so they can say they bought it from this guy who knows everything."