ἐπὶ ξυροῦ γὰρ ἀκμῆς ἔχεται ἡμῖν τὰ πρήγματα → our affairs are balanced on a razor's edge, our affairs are set upon the razor's edge
slippery: P. ὀλισθηρός.
muddy: P. and V. θολερός, P. βορβορώδης, πηλώδης.