Pervasive (adjective)

1. Spread throughout an area or group.
2. Having a wide influence or effect; prevalent.
3. Difficult to escape or avoid.

Origin:

From the latin pervadere "to spread through".

Examples:

1. The pervasive smell of smoke filled the air.
2. Pervasive poverty affects many people in the country.
3. The pervasive use of technology is changing the way we live.
4. Pervasive corruption is a major problem in the government.
5. The pervasive advertising made it impossible to avoid the product.