nonachiever

[ non-uh-chee-ver ]
/ ˌnɒn əˈtʃi vər /

noun

a student who fares poorly in the classroom or has failing grades.
any person who does not succeed or progress, especially because of lack of interest or motivation.

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Origin of nonachiever

1970–75; non- + achiever
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020