静穏 (せいおん, seion) Japanese meaning: tranquility | KotomoraFreq.FrequencyTop 100,000 つ
立
っ
て
い
なかっ
た
。
The sea was calm, without a single wave.
Etymology
Compound of 静 (still, quiet) and 穏 (calm, peaceful). The reading せいおん is the on'yomi of both characters.