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v. un·der·per·formed, un·der·per·form·ing, un·der·per·forms
1. To perform not as well as (something else): three stocks that underperformed the market as a whole.
2. To perform (a musical or theatrical work, for example) too seldom: In recent years, her plays have been underperformed.
To exhibit a level of performance that is below the standard: a company that underperformed last year.

un′der·per·for′mance n.
un′der·per·form′er n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.underperformer - a student who does not perform as well as expected or as well as the IQ indicatesunderperformer - a student who does not perform as well as expected or as well as the IQ indicates
educatee, pupil, student - a learner who is enrolled in an educational institution
2.underperformer - a business that is less successful than expectedunderperformer - a business that is less successful than expected
business, business concern, business organisation, business organization, concern - a commercial or industrial enterprise and the people who constitute it; "he bought his brother's business"; "a small mom-and-pop business"; "a racially integrated business concern"
References in periodicals archive ?
AUD-JPY was also a notable underperformer, with the antipodean currency faring poorly in the risk-off environment, despite above-forecast Australian GDP and building approvals data.
You know how critical every sale is to your business, and having an underperformer like Justin on the salesfloor could jeopardize profits.
The British FTSE 100 was the major underperformer, down 0.
That is already one more than in London, when swimming was seen as the major underperformer in a successful Games.
Revlon and Garnier -- a rare underperformer for China market leader L'Oreal have announced their pullout from China.
But many boards have been less inclined to deal with a more insidious phenomenon in their midst--the 'go-along-to-get-along' underperformer who makes no waves but also adds little value.
The Shanghai property sub-index was a key underperformer among sectors, down 1.
Leaving conspiracy theories aside, we highlight that Rostelecom's stock has been an underperformer YtD.
Sandler, looking to rebound from last year s underperformer "Funny People," joins forces with Kevin James, Chris Rock, David Spade and Rob Schneider in the $70 million Sony comedy "Grown Ups," which should open at No.
It's clear from last week's debate the country wants change," smarmed underperformer David Cameron.
federal law for the first time in the city, allowing him to take over a high school designated as an underperformer years.
It will look inconsistent to a judge or jury, however, if an underperformer gets the same raise as another employee doing well.