nothing, nothingness / (Buddhism) mu; the null set: neither yes nor no (in response to a koan or other question that mistakenly assumes an affirmative or negative answer).

nothing / nothingness / none / nil / not

non-, un- / non-, un-

unreasonably, absurdly, recklessly, at random

not contacting for a while, a long silence

七七日: the forty-ninth day after a person dies; the Buddhist memorial service that occurs forty-nine days after a person dies

乳: milk; breast; latex (milky substance in plants) / 父: one's own father; a father figure; the Christian God / 致知: the pursuit of knowledge; / 遅遅, 遅々: slowness, tardiness; a long day

遅遅, 遅々: to be late

乳, 父: a surname / 父子: a place name

日日: day by day