sneaky

An adjective "sneaky" means being able to move quietly and secretly, often without anyone noticing.

When we call someone or something sneaky, it usually means they're good at doing things on their own without making a big noise. For example, if you leave your room a mess and then tidy up before your parents come in, that's a pretty sneaky thing to do! People might also use the word for animals, like cats who sneak into rooms without anyone seeing them. It can also imply being dishonest or deceitful, so if someone is playing tricks on their friends and doesn't get caught, they might be seen as sneaky too.