General:
* Limited
* Narrow
* Partial
* Incomplete
* Superficial
* Restricted
* Selective
More specific:
* Abridged (referring to a shortened version of something)
* Concise (referring to something that is brief and to the point)
* Summary (referring to a brief overview of something)
* Specific (referring to something that is focused on a particular detail)
The best antonym for "comprehensive" will depend on the context of the word's use.