considerably◼◼◼(significantly) adverb [UK: kən.ˈsɪ.də.rə.bli] [US: kən.ˈsɪ.də.rə.bli]Your English has improved considerably. = Ton anglais s'est considérablement amélioré.
significantly◼◼◼(in a significant manner: notably) adverb [UK: sɪɡ.ˈnɪ.fɪk.ənt.li] [US: sɪg.ˈnɪ.fɪk.ənt.li]