Cách sử dụng
The word 'insidious' means something that is harmful or dangerous, but it's not obvious at first. It often sneaks up on you slowly and can cause damage before you even notice. For example, a disease can be insidious because the symptoms may not be noticeable right away, and the illness can become more dangerous over time. Or, a person's behavior can be insidious if they are trying to manipulate or control you in a sneaky way, without you realizing it. It's important to be aware of insidious things and take steps to protect yourself from them.