General Antonyms:
* Limited: This is a good general antonym, meaning confined or restricted.
* Restricted: Similar to "limited," it implies boundaries or constraints.
* Narrow: Suggests a small scope or focus.
* Sparse: Means thinly spread or lacking in quantity.
Contextual Antonyms:
* Brief: If "extensive" refers to duration, "brief" would be the antonym.
* Superficial: If "extensive" refers to depth, "superficial" would be the antonym.
* Concise: If "extensive" refers to length or detail, "concise" would be the antonym.
* Compact: If "extensive" refers to size, "compact" would be the antonym.
Example:
* Extensive knowledge: Antonym could be limited knowledge, superficial knowledge, or narrow knowledge.
It's best to choose the antonym that most accurately reflects the meaning of "extensive" in the specific context.