"slithering" in the verb sense
1. slither, slide
to pass or move unobtrusively or smoothly
"They slid through the wicket in the big gate"
"slithering" in the adjective sense
1. slipping, slithering
moving as on a slippery surface
"his slipping and slithering progress over the ice"
Source: WordNet® (An amazing lexical database of English)
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