← BackshareGuesssneakingly/ˈsniːkɪŋli/adverbIn a secret, sly, or dishonest manner; without being noticed.The cat sneakingly crept up on the mouse.She sneakingly checked her phone under the desk during class.He sneakingly slipped the note into her bag when she wasn't looking.SynonymsslylysecretlyAntonymsopenly