scaltro significa in inglese

clever [cleverer, cleverest]▼(mentally quick or sharp)
adjective
[UK: ˈkle.və(r)] [US: ˈkle.vər]

shrewd [shrewder, shrewdest]▼(artful, tricky or cunning)
adjective
[UK: ʃruːd] [US: ˈʃruːd]

slick [slicker, slickest]▼(clever, making an apparently hard task easy)
adjective
[UK: slɪk] [US: sˈlɪk]