Superlative form meaning most calm or most characterized by a calm quality; most peaceful.
From 'calmy' or 'calm' with superlative suffix '-est'. This appears to be a variant or archaic formation for expressing the highest degree of calmness.
English adjective forms are wonderfully redundant—'calmest,' 'calmier,' and 'calmiest' technically all convey comparison, yet speakers overwhelmingly prefer 'calmest,' showing how language naturally consolidates similar forms.
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