Difference between Hush-hush and Cloak-and-dagger

What is the difference between Hush-hush and Cloak-and-dagger?

Hush-hush as an adjective is secret, not spoken of (or spoken of only in hushed whispers between insiders). while Cloak-and-dagger as an adjective is marked by furtive secrecy, often with a melodramatic tint or espionage involved.

We hope you now know whether to use Hush-hush or Cloak-and-dagger in your sentence.