παράφωνος
From LSJ
βορβόρῳ δ' ὕδωρ λαμπρὸν μιαίνων οὔποθ' εὑρήσεις ποτόν → once limpid waters are stained with mud, you'll never find a drink
English (LSJ)
ον,
A sounding beside παράφωνοι, οἱ, accompaniment, obbligato, Longin.28.1. II sounds midway between consonances and dissonances, e.g. the tritone, Gaud.Harm.8.