Definition of "deadly" []

• Causing or tending to cause death: deadly weapons; a deadly spill of radioactive waste products. See Synonyms at fatal. (adjective)
• Suggestive of death: a deadly pallor. (adjective)
• Aiming or wanting to kill; implacable: deadly enemies. (adjective)
• Destructive in effect: gave the film a deadly review. (adjective)
• Tending to take away vitality, effectiveness, or force: the deadly habit of procrastination. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "If it was not such a deadly climate, you would find much to interest you in these parts; but it is _very deadly_."
• "As she watched him reading, his face pale, his expression deadly serious, as he seemed to be fiercely concentrating, she guessed that he was going over those parts of the letter that seemed to suggest she was needed by her mother in Enniscorthy."
• "Quentin Forbes was slowly returning his pen to his pocket, his eyes following Wolmar, his expression deadly."