Marked or characterized by accidents; having experienced mishaps or damage.
From accident (Latin 'accidere' meaning 'to happen') plus the past participle suffix -ed. Literally means 'having undergone accidents' and reflects how English forms adjectives from nouns describing affected states.
This word is rarely used in modern English, but it reveals how English speakers once loved making adjective-verbs from any noun—notice we still do this with 'wounded' and 'gifted' but have mostly abandoned 'accidented' in favor of 'accident-prone.'
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