surreptitiously

adv

1. In a surreptitious manner; stealthily, furtively, secretly.

   “Hiro and Chuck grab the closest thing they can find to a corner table. Hiro buttonholes a waiter and surreptitiously orders a pitcher of Pub Special, mixed half and half with nonalcoholic beer.”

   “They stayed together during three dances, went out on to the terrace, explored wherever they were permitted to explore, paid two visits to the buffet, and enjoyed themselves much in the same way as if they had been school-children surreptitiously breaking loose from an assembly of grown-ups.”

   “While Brown distracted the usually hyperfocused Mangini, safety Kerry Rhodes and linebackers Eric Barton and Jonathan Vilma grabbed a cooler of Gatorade and surreptitiously assumed their positions according to plan.”