Having or showing expert skill or knowledge; demonstrated by an expert. (Rare or non-standard form.)
From expert + -ed (adjective suffix forming past participles or adjectives). While 'expert' is primarily a noun or adjective already, adding -ed creates a somewhat redundant or archaic construction. The standard form would simply be 'expert' or 'expert-level.'
'Experted' is such an awkward word that almost no one uses it—English already had 'expert' as an adjective, so adding '-ed' feels like grammatical overkill, which is why it never really caught on!
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