Insidious and Under cover

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

Under cover and insidious are semantically related In some cases you can replace phrase "Under cover" with "Insidious", this terms are similar.

Nearby Word: insidiously

Insidious and under cover are semantically related in sneaky topic. Sometimes you can use "Insidious" instead an adjective phrase "Under cover", if it concerns topics such as deceitful, underhand.