然さならず

Meanings

1

it is not so; it does not seem so

archaic

Archaic expression used in classical Japanese to deny a state or appearance. Not used in modern speech.

古こ典てんでは「然さならず」と書かいて「さならず」と読よませ、事じ実じつがそうではないことを表あらわす。
In classical texts, 然ならず is read as さならず and indicates that something is not the case.

2

it should not be so

Archaic expression conveying that something ought not to be the case. Found in older written language.

「然さならず」は、古ふるい文ぶん章しょうで「そうあるべきではない」という意い味みで使つかわれた。
然ならず was used in old writing to mean 'it should not be so.'