When a product, service, etc., is not being bought by enough people
Circumstances where people have applied for fewer shares than are available in a new issue.
The opposite of oversubscribed and describing a situation when a new stock issue is not fully bought... <a target=_blank href='http://www.finance-glossary.com/terms/undersubscribed.htm?id=13058&ginPtrCode=00000&PopupMode=false' title='Read full definition of undersubscribed'>more</a>