This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
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v. To perform not as well as (something else): three stocks that underperformed the market as a whole.

v. To perform (a musical or theatrical work, for example) too seldom: In recent years, her plays have been underperformed.

verb-intransitive. To exhibit a level of performance that is below the standard: Defense industry companies have underperformed during the last two quarters.

v. To underachieve, to not reach standards or expectations, especially with respect to a financial investment.

v. perform less well or with less success than expected

v. perform too rarely

"Much of the upside from the subsidy appears to be priced into today's jump; expect short-term underperform, especially if subsidy details clarify enthusiasm wasn't fully justified."

overperform   

underperformed    underperforming    underperforms   

perform    do   

underperformer    underperformance