Nebulous (adjective)
غیر واضح، دھندلا
in the form of a cloud or haze; hazy.
Example: “a giant nebulous glow”
Insidious (adjective)
پرفریب، ناپاک شیطانیت والا
proceeding in a gradual, subtle way, but with very harmful effects.
Example: “sexual harassment is a serious and insidious problem”