Na-nay
From The Stargate Omnipedia
Abydonian word for "no."
KEY EPISODES
"Stargate" the Movie – Skaara uses this word to assure his friends that O'Neill's lighter is not going to destroy them.
Children of the Gods – When Skaara is taken to be a host, Skaara shouts this word in protest.
Within the Serpent's Grasp - Klorel uses this term to the Jaffa (suggesting that it has Goa'uld origins).
Stargate Origins - Catherine, Wasif, and Beal struggle to learn the Abydonians' language when they visit the planet in 1938.