* Aftertaste: This is the most direct opposite, referring to a taste experienced after the initial taste.
* Hindsight: This refers to understanding something after it has happened, contrasting with the anticipation of a foretaste.
* Aftermath: This refers to the consequences of an event, which is the opposite of the anticipation of a foretaste.
* Experience: While not a perfect antonym, "experience" implies actually living through something, contrasting with the theoretical anticipation of a foretaste.
Ultimately, the best antonym will depend on the specific meaning of "foretaste" in your context.