creeping
Definitions
Moving slowly and carefully, especially in order to avoid being heard or noticed.
Developing or advancing gradually and almost imperceptibly.
Growing or spreading along the ground or a surface, as with certain plants.
Examples
The creeping ivy slowly covered the entire brick wall of the old house.
She felt a creeping sense of dread as she walked down the dark, empty hallway.
Synonyms
crawling slithering stealthy insidious sneaking gradual clambering