What is the antonym for word advantageous?

The antonym for advantageous depends on the specific context, but some common antonyms include:

* Disadvantageous: This is the most direct opposite, meaning unfavorable or harmful.

* Detrimental: This implies something that causes harm or damage.

* Unfavorable: This is a general term for something that is not beneficial.

* Harmful: This refers to something that causes damage or injury.

* Unprofitable: This refers to something that does not generate a profit.

* Unbeneficial: This is a more formal way of saying "not beneficial."

The best antonym will depend on the specific situation and the intended meaning.