segnis

Etymology
. An adjective in reflecting possibly  or, but with semantic problems. Cognates would then include 🇨🇬 and. Kroonen adds 🇨🇬, and 🇨🇬, for a.

Otherwise, if not related to the Ancient Greek words, possibly from, with acceptable semantic shift from "sticky" to "inert". In both cases the long vowel possibly reflects an original root noun, or otherwise remains unexplained.

Adjective

 * 1) slow, tardy, torpid, inactive, unenergetic, lazy