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).

non-, un- / non-, un-

Of low quality

interrogative personal pronoun: who, whom

(archaic) interrogative personal pronoun: who, whom

(obsolete, persists in some fossilized expressions) interrogative personal pronoun: who, whom

anyone

somebody, someone

(with negative verbs) no one, nobody / anyone, anybody

Used other than figuratively or idiomatically: see 誰, が.