Hush-hush and Middle-of-the-road

Hush-hush adjective - Not known or meant to be known by the general populace.

Middle-of-the-road and hush-hush are semantically related. In some cases you can use "Middle-of-the-road" instead an adjective phrase "Hush-hush".

Middle-of-the-road adjective - Avoiding major social change or extreme political ideas.

Hush-hush and middle-of-the-road are semantically related. Sometimes you can use "Hush-hush" instead an adjective phrase "Middle-of-the-road".