i Register
In some senses, slither is marked as archaic. Watch for register when choosing this word.
ADV
silently
The lizard slithered silently across the garden path before disappearing into the bushes.
helplessly
The snake slithered helplessly across the hot pavement, searching for shade.
away
The lizard slithered away quickly when it spotted the cat approaching.
PREP
across, along, down, on, over, to, etc.
The snake slithered across the garden path and disappeared into the bushes.