calmness calmness /ˈkɑːlmnəs/

noun

1. () Steadiness of mind under stress  ( collectedness , unflappability , equanimity , calm , calmness , composure )
   steadiness of mind under stress
    He accepted their problems with composure and she with equanimity
   he accepted their problems with composure and she with equanimity
   
2. A feeling of calm; an absence of agitation or excitement  ( calmness )
   a feeling of calm; an absence of agitation or excitement
   
3. An absence of strong winds or rain  ( calmness )
   an absence of strong winds or rain