placid, serene, quiet, sedate, tranquil, equanimity, composure, quieten, becalm, still, more...

agitated, tense, anxious, turbulent, restless

serenity, tranquility, peacefulness, stillness, quietude, placidity, composure, relaxation, more...

dead, relative, great, perfect, comparative, flat, outward, inner, usual, holy, complete

not worried,   not angry,   even keeled,   very still,   not nervous,   to soothe,   not worry,   smooth or soothe,   feeling relieved,   no wind