微乎其微

Tiny; miniature; slight; subtle; profound; abstruse; to decline; one millionth part of; micro- prefix; also a surname.

Classical particle similar to 於; used at the end of a sentence to express a question, doubt, astonishment, or to call someone.

Pronoun: his; her; its; their; that; such; it; function word: used at end of sentence to indicate doubt; used in middle or end of sentence after 彼 or 何.