ʝaɣnís comes from the Turkish yanlış (Papanis & Papanis 2004˙ Alvanos 2011). There is also a Turkish dialectal form yaŋnış (Ralli 2017).
E.g. tútu pó-kani ídan miɣálu ʝaɣnís. túto pu-ékane ítan miɣálo ʝaɣnís. ‘What he did was a big mistake’.