Lydnevi is a fictional North Slavic language created in 2002 by the Czech linguist Libor Sztemon.

In addition, ⟨x⟩ represents ɣ͡z.

Lydnevi has 8 monophthongs and 6 diphthongs.

Lydnevi's diphthongs are ⟨ai⟩ /aɪ̯/, ⟨ei⟩ /eɪ̯/, ⟨oi⟩ /oɪ̯/, ⟨au⟩ /au̯/, ⟨eu⟩ /eu̯/, and ⟨ou⟩ /ou̯/.

Lydnevi also has three digraphs: ⟨ch⟩ /x/, ⟨nj⟩ /ɲ/, and ⟨th⟩ /tʰ/.

Sztemon included the Lord's Prayer as an example text on his website.

Otec navo,
Jaš jési na nebesai,
Da jest posvetyn tavo nam.
Da jest prihedyn tavo kralestvo.
Da jest stanyn tavo vilja, jako na nébe, tako y na zéma.
As navo bréd e keždanyn davat i nave danas.
Ø adpoštat i nave as navo dluhem jako y me adpoštalesom i navo dluhare.
Ø nevøvedat as nave vø pokušenje, ale nesvabodat as nave é zølyn.
Navad tavo jest kralestvo y moc y slava navéke.
Amén.