accidenton Basic wordsalso onCEFR Elementary (A2)? CEFR Upper intermediate (B2)? Band 2 (BND2)? 事故,意外 accidents accidents(noun) 事故(accident的复数),意外事故 accident accident(noun) 事故,意外 accidental accidental(adjective) 偶然的,意外的,附属的 accidentally accidentally(adverb) 偶然地,意外地 Forms nounadjectiveadverb accidents accidental accidentally accident