What word can be the antonym for thorought?

There isn't one single perfect antonym for "thorough". It depends on the context and what aspect of "thoroughness" you want to oppose. Here are some options:

General Antonyms:

* Superficial: This implies a lack of depth or detail.

* Cursory: This means hasty and incomplete.

* Perfunctory: This suggests a lack of care or enthusiasm.

* Incomplete: This simply means not finished.

* Partial: This implies only covering part of something.

More Specific Antonyms:

* Sloppy: This emphasizes a lack of care or precision.

* Careless: This implies a disregard for accuracy.

* Haphazard: This means random and disorganized.

* Random: This emphasizes a lack of system or plan.

The best antonym for "thorough" will depend on the specific situation.