A primitive voiceless stop in the c-series (palatals), it was probably a voiceless palatal stop: IPA [c] (SD/416). This sound does not appear in English, but can be approximated by pronouncing a [k] with the tongue moved forward to the y-position. It became an [s] in Classical Adûnaic along with the other voiceless consonants of the c-series (SD/418).