Learn English – word/ phrase to describe somebody who has devoted their life to practising something but is still not very good at it

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I need a word/phrase/idiom (either adjective or noun) to describe somebody who has devoted their life to practising something but is still not very good at it.

Example:

Look at Uncle, practised music all his life and still not very good at it: he is __________ (adjective) or he is a _________ (noun)

Please note that the person has shown great interest and committment over a lifetime but possibly lacked the special skill or talent required to really excel at their chosen field.

Note 2: failure, misfit, disappointment, ordinary, poor and mediocre are not a good fit for the word I am seeking, but the case of mediocre professional musicians was the sad reality that prompted my question.

Best Answer

I'd suggest Manqué, a somewhat uncommon term borrowed from French. Wikipedia describes it thus:

Manqué (feminine, manquée) is a term used in reference to a person who has failed to live up to a specific expectation or ambition. It is usually used in combination with a profession: for example, a career civil servant with political prowess who nonetheless never attained political office might be described as a "politician manqué". It can also be used relative to a specific role model; a second-rate method actor might be referred to as a "Marlon Brando manqué".