Lack of knowledge is a term that can be described by two words: IGNORANCE and NESCIENCE. IGNORANCE is defined as a lack of knowledge or information, while NESCIENCE is defined as a lack of understanding or awareness. Both terms refer to a lack of knowledge or understanding, but IGNORANCE implies a willful disregard for knowledge, while NESCIENCE implies an unawareness of knowledge. In either case, the result is a lack of knowledge or understanding.