accidental◼◼◼(happening by chance) adjective [UK: ˌæk.sɪ.ˈden.tl̩] [US: ˌæk.sə.ˈden.tl̩]It was an accidental meeting. = C'était une rencontre accidentelle.
casual◼◻◻(happening by chance) adjective [UK: ˈkæ.ʒʊəl] [US: ˈkæ.ʒə.wəl]
accidentally◼◼◼(unexpectedly, unintentionally) adverb [UK: ˌæk.sɪ.ˈden.tl̩i] [US: ˌæk.sə.ˈden.tl̩i]Sami accidentally ran over Layla. = Sami a accidentellement écrasé Layla.
randomly(in a random way) adverb [UK: ˈræn.dəm.li] [US: ˈræn.dəm.li]