General Antonyms:
* Center: This is the most direct opposite, referring to the very heart of something.
* Core: Similar to "center," it emphasizes the essential part of something.
* Heart: Focuses on the emotional or vital center.
* Interior: Refers to the inside or inner part of something.
Contextual Antonyms:
* Downtown: If "outskirts" refers to the edge of a city, "downtown" would be the opposite.
* City center: Another way to describe the opposite of the city's outskirts.
* Urban area: If "outskirts" refers to a rural area bordering a city, "urban area" would be the opposite.
* Main street: This emphasizes the central commercial area of a town.
The best antonym depends on the specific meaning of "outskirts" in your sentence.