sigiloso betyder på engelska

furtive▼(stealthy)
adjective
[UK: ˈfɜː.tɪv] [US: ˈfɝː.tɪv]

stealthy [stealthier, stealthiest]▼(characterized by or resembling stealth or secrecy)
adjective
[UK: ˈstel.θi] [US: ˈstel.θi]While Mary gawked out the window, someone crept up stealthily behind her. = Mientras Mary miraba embobada por la ventana, alguien se le acercó sigilosamente por la espalda.