creeping
adjectiveUK /ˈkriːpɪŋ/
US /ˈkriːpɪŋ/
Moving slowly and quietly so nobody hears you.
A creeping cat snuck up on the bird.
OTHER MEANINGS
2. Spreading slowly over a surface, like a plant.
Creeping ivy covered the old wall.
3. Happening very slowly and gradually.
He felt a creeping tiredness after the long walk.
4. Behaving in an unpleasant, overly friendly way to gain favor.
His creeping flattery made everyone uncomfortable.