placid
adjectiveUK /ˈplæs.ɪd/
US /ˈplæs.ɪd/
Calm and quiet, not easily upset or excited.
The placid lake reflected the mountains perfectly.
OTHER MEANINGS
2. Not easily angered or disturbed; even-tempered.
She has a placid nature and rarely raises her voice.
3. Of a place or situation: peaceful and undisturbed.
They spent a placid afternoon reading in the garden.
4. Showing little movement or activity, as water or weather.
The sea was placid under the pale morning sky.