Insidiously: meaning, definitions and examples

manner of action

Insidiously refers to actions that proceed in a gradual, subtle way but with harmful effects. This term is often used to describe something that appears harmless at first but eventually leads to negative consequences. It implies an underhanded or deceitful approach. The insidious nature of certain diseases or tactics can make them particularly dangerous as they can go unnoticed until significant damage has been done.

cunningly, deceitfully, sneakily

Examples of usage

• The insidiously spread misinformation misled the public.

• He dealt with insidiously creeping doubts about his decision.

• The insidiously introduced changes went unnoticed for months.

• Her insidiously charming personality masked her true intentions.