What does "paper-thin" mean?

Very thin, such as the quality of paper.

What is a synonym for "paper-thin"?

Common synonyms include: microscopically thin, thin sheet.

adj

adj ·Rare ·Advanced level

Adjective

1
Very thin, such as the quality of paper. literally, not-comparable
2
Insubstantial. figuratively, not-comparable
"As late as 1948 NKP, for its part, pitted its Berkshires against borrowed road diesels and declared that the difference in costs was less than paper thin."

"Compared with Saturn's size, the rings appear paper-thin."