1 a : destitute of knowledge or education (an ignorant society); also : lacking knowledge or comprehension of the thing specified (parents ignorant of modern mathematics) b : resulting from or showing lack of knowledge or intelligence (ignorant errors).
Merriam Webster Online
"American parents and educators seem to regard their children's education as an afterthought; something that detracts from their 3 month summer vacation plans. Lest we start talking about ineffective local, state and federal governments when it comes to doing a better job of teaching our kids better."
Seattle Post-Intelligencer Sound Off #77007, October 3, 2006
Image from Flamevault.com
EDIT: define irony! The image is broken, and I cannot recall what it was supposed to be...