Insidious and Secret

Insidious adjective - Working or spreading in a hidden and usually injurious way.

Secret and insidious are semantically related in sneaky topic. In some cases you can use "Secret" instead an adjective "Insidious", when it comes to topics like secretive.

Nearby Word: insidiously

Secret adjective - Undertaken or done so as to escape being observed or known by others.

Insidious and secret are semantically related in sly topic. Sometimes you can use "Insidious" instead an adjective "Secret", if it concerns topics such as secretive.

Nearby Words: secretive, secrecy, secreted, secretly, secretary