slippery(of a surface) adjective [UK: ˈslɪ.pə.ri] [US: sˈlɪ.pə.ri]The slippery snake slithered right out of his hand. = La escurridiza serpiente se deslizó fuera de su mano.
sneaky [sneakier, sneakiest](difficult to catch due to constantly outwitting the adversaries) adjective [UK: ˈsniːk.i] [US: ˈsniːk.i]