Having fewer participants or subscribers than desirable.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "undersubscribed" in a sentence
"Check the Colorado Regs online and look for the "undersubscribed" Units/hunts marked with an asterisk*."
"The low offer size, announced Monday when non-core markets were still under heavy pressure, was seen by the market as a precautionary measure to avoid an undersubscribed auction."
"One issue with these programs is simply that they're undersubscribed."