underachievement

un·der·a·chieve

U0047100 (ŭn′dər-ə-chēv′)intr.v. un·der·a·chieved, un·der·a·chiev·ing, un·der·a·chieves To perform worse or achieve less success than expected.

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un′der·a·chieve′ment n.un′der·a·chiev′er n.

Thesaurus

Noun

1.

underachievement - poorer than expected performance (poorer than might have been predicted from intelligence tests)performance - any recognized accomplishment; "they admired his performance under stress"; "when Roger Maris powered four home runs in one game his performance merits awe"overachievement - better than expected performance (better than might have been predicted from intelligence tests)