Answer: CALMEST

AnswerCrossword Clue
CALMESTMost relaxed
calmestee from agitation, excitement, or disturbance
calmestCALM, free from agitation
calmestmarked by calm still a calm sea
CALMESTPoised to the max
CALMESTLeast perturbed
CALMESTLeast wavy
CALMESTLeast rocky
CALMESTStill the most
CALMESTMost cool
CALMESTLeast ruffled
CALMESTMost self-possessed.
CALMESTMost placid.
CALMESTMost composed.
CALMESTMost undisturbed.
CALMESTLeast disturbed.
CALMESTLeast rattled
CALMESTMost serene
CALMESTSerene to the max