- proceeding in a gradual, subtle way, but with harmful effects；treacherous; crafty
- 1. proceeding in a gradual, subtle way, but with harmful effects sexually transmitted diseases can be insidious and sometimes without symptoms
- ▪ treacherous; crafty tangible proof of an insidious alliance
- proceeding in a gradual, subtle way, but with very harmful effects: sexual harassment is a serious and insidious problem
... zodiac is the snake. 我的生肖是蛇 I think that snake is insidious, aggressive, cold-blooded and clever reaction. 我覺得蛇陰險 攻擊力強 冷血 反應...
..., I would rather choose to stay silent. If silence can be insidious, I would rather choose to leave.
...硫化氫有時因為有爛雞蛋的氣味而被稱為 " 臭氣 " It is an insidious poison that irritates the eyes,nose,and throat. 這是一種會危害眼睛...