This is the 8888th most frequent French word.
calmes
"Calmes" means "calm" or "quiet" in English.
Here, 'calmes' serves as an adjective modifying the subject 'Nous', corresponding to the plural masculine/feminine form in agreement with the subject.
Nous restons calmes malgré la situation.
We remain calm despite the situation.
'Calmes' is used as an adjective to describe 'eaux', indicating the peaceful and still nature of the waters during the summer months.
Les eaux du lac sont calmes en été.
The waters of the lake are calm in summer.
In this sentence, 'calmes' is used as an adjective describing the children ('enfants'), agreeing in number and gender with them.