verb (used with object), verb (used without object)
to perform less well than (another of its kind, a general average, etc.) or less well than expected: Surprisingly, the stock has underperformed the market indexes all year. Several of our best players consistently underperform.

under- + perform

underperformance, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To underperform

1. perform less well or with less success than expected; "John consistently underachieves, although he is very able"; "My stocks underperformed last year" [syn: underachieve
2. perform too rarely; "Her plays are underperformed, although they are very good" 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Wilcox cites a single study to make her case that organic farms underperform
  industrial ones.
Even those who annoy and underperform can surprise us in positive ways.
One of the hardest fantasy pills to swallow is seeing one of your high draft
  picks underperform.
They buy expensive funds that underperform the broad market.
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