complete denial of knowing (an incident in question)

to know through one's own experience

to have no way of knowing; to be completely ignorant of

to make known

(Classical Japanese, archaic, honorific) to know

God only knows

Shimeji mushroom

culture medium

Kyūjitai form of 地区: zone (area distinguished on the basis of a particular characteristic etc)

epicenter(AmE), epicentre(BrE) - the point on the Earth's surface directly above the focus of an earthquake. / (figuratively) The focal point of any activity, especially if dangerous or destructive .