In a secretive or quiet manner, often to avoid being noticed

चुपचाप

English Usage: The cat moved stealthily through the garden.

Hindi Usage: बिल्ली बगीचे में चुपचाप चल रही थी।

Characterized by secrecy or concealment

गुप्त

English Usage: The stealthy approach of the fox allowed it to capture its prey easily.

Hindi Usage: लोमड़ी के गुप्त तरीके ने उसे अपना शिकार करने में मदद की।