dead calm in English dictionary dead calm Meanings and definitions of "dead calm" (nautical) A perfectly flat sea with no waves adjective (of a body of water) Completely still with no waves and no wind. noun (nautical) The condition of a perfectly flat sea with no waves and no wind. flat sea without waves more Grammar and declension of dead calm dead calm ( plural dead calms) dead calm (not comparable) dead calm (uncountable) more Dead Calm Meanings and definitions of "dead calm" Dead Calm (film) more Dead calm Sample sentences with "dead calm" Declension Stem Match words all exact any Try again Available translations Bulgarian Finnish French German Greek Hungarian Icelandic Italian Japanese Latin Manx Maori Persian Polish Russian Scottish Gaelic Sicilian Spanish Swedish Authors