seasmhach
Definitions (by source)
“grounded” (‘upon’, ar) 49.12; with prefix, neamh-sheasmhach “transitory” 36.18-19
Aibidil Gaoidheilge & Caiticiosma: Seaán Ó Cearnaigh's Irish primer of religion, published in 1571. Editor: Brian Ó Cuív.