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omninescient
omninescient adj. 
/ˌɑmnəˈnɛsiənt/, /ˌɑmniˈnɛʃ(i)ənt/, /ˌɑmniˈnɛsiənt/ knowing nothing; completely ignorant.
Brit. /ˌɒmnᵻˈnɛsɪənt/
, /ˌɒmnᵻˈnɛsɪənt/U.S. /ˌɑmnəˈnɛʃ(i)ənt/
, /ˌɑmnəˈnɛʃ(i)ənt//ˌɑmnəˈnɛsiənt//ˌɑmniˈnɛʃ(i)ənt//ˌɑmniˈnɛsiənt/ΘΚΠ
the mind > mental capacity > knowledge > want of knowledge, ignorance > [adjective] > completely
know-nothing1818
omninescient1890
pig-ignorant1956
1890 Sat. Rev. 22 Nov. 574/2 One of the omniscient, or omni-nescient, persons who do ‘London Correspondence’.
1912 Mind 21 164 As, therefore, everything is such that there is some one who does not know it and cannot do it, the Absolute would have to be at once omniscient and omninescient.
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