"writhing" in the verb sense
1. writhe, wrestle, wriggle, worm, squirm, twist
to move in a twisting or contorted motion, (especially when struggling
"The prisoner writhed in discomfort"
"The child tried to wriggle free from his aunt's embrace"
"writhing" in the adjective sense
1. wiggly, wriggling, wriggly, writhing
moving in a twisting or snake-like or wormlike fashion
"wiggly worms"
Source: WordNet® (An amazing lexical database of English)
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