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He was balanced precariously on top of the fence. The rock was precariously balanced on the edge of the cliff.
The schoolbus balanced precariously on the edge of the cliff.
The boat rocked precariously when my sister jumped into it.
She clung precariously to the ledge, trying not to slip off the edge.
The word precariously, like most words that end in -ly, is an adverb.