something calm, tranquil, in repose, like the sea, or the weather, when there is no current or high wind (see Molina)
Alonso de Molina:
tlamattica. cosa sosegada, oreposada, assi como la mar, o el tiempo, quando no ay ni corre rezio viento. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 126r. col. 1. Thanks to Joe Campbell for providing the transcription.