furtively
Definitions
In a way that attempts to avoid notice or attention; secretively.
Suggestive of guilty nervousness or slyness.
Examples
The student glanced furtively at his neighbor's exam paper while the teacher was distracted.
She furtively slipped the secret note into his pocket before walking away.
The cat moved furtively through the tall grass, stalking its unsuspecting prey.
Synonyms
secretly stealthily slyly covertly surreptitiously clandestinely sneakily