* Superficial: This implies a lack of depth or detail, focusing only on the surface level.
* Incomplete: This means something is not finished or lacking parts.
* Cursory: This describes a quick and superficial examination, not paying attention to details.
* Perfunctory: This refers to something done in a routine way, without much care or effort.
* Sloppy: This implies a lack of care and attention to detail, resulting in a messy or untidy outcome.
* Half-hearted: This describes an action done without full commitment or enthusiasm.
* Sketchy: This means something is incomplete, lacking detail, or unreliable.
The best antonym will depend on the specific situation and what aspect of "thorough" you want to contradict.