sicuramente bedeutet auf Englisch

firmly▼(in a firm or definite or strong manner)
adverb
[UK: ˈfɜːm.li] [US: ˈfɝːm.li]

safely▼(in a safe manner)
adverb
[UK: ˈseɪ.fli] [US: ˈseɪ.fli]

surely▼(certainly, undoubtedly)
adverb
[UK: ˈʃʊə.li] [US: ˈʃʊr.li]Surely he won't come. = Sicuramente non verrà.