Synonym: baneful, deathly, deucedly, devilishly, insanely, lethal, lifelessly, madly, mortal, mortal, pernicious, pestilent, venomous, virulent. Similar words: deadline, badly, headline, idea, death, rapidly, dealer, deal in. Meaning: ['dedlɪ] 
adj. 1. causing or capable of causing death 2. of an instrument of certain death 3. extremely poisonous or injurious; producing venom 4. involving loss of divine grace or spiritual death 5. exceedingly harmful 6. (of a disease) having a rapid course and violent effect. adv. 1. as if dead 2. as if produced by death 3. (used as intensives) extremely.
adj. 1. causing or capable of causing death 2. of an instrument of certain death 3. extremely poisonous or injurious; producing venom 4. involving loss of divine grace or spiritual death 5. exceedingly harmful 6. (of a disease) having a rapid course and violent effect. adv. 1. as if dead 2. as if produced by death 3. (used as intensives) extremely. 
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91. Recognizing that the epidemic was due to this deadly disease, he kept careful notes of every case.
92. One of the most deadly of all these creatures is the elusive Cave Squig.
93. In the First World War pneumonia was as deadly as bullets and shells.
94. Old rivalries are barely submerged and every quip has a deadly double meaning.
95. The noise level was high in both languages; all faces were deadly serious.
96. His enemies are not the fearsome ape Donkey Kong or King Bowser the dragon - though they can be as deadly.
97. In a small enterprise or department, management by inertia is a deadly disease.
98. The rebels fought like demons, and under cover of the dense underbrush poured deadly volleys upon us.
99. Was what they had taken to be a problem of the stomach something more deadly?
100. For political systems[Sentence dictionary], the last decade has been the most deadly in history.
101. It sounds like a sick joke but they are deadly serious.
102. Use deadly force if other measures would be reasonably effective.
103. Yesterday's train crash near Selby, North Yorkshire, was clearly a tragic consequence of chance and deadly events.
104. Police arrested Hale, because they believed the altercation with Tavai had not justified the use of deadly force.
105. My hands and feet are registered with the local constabulary as deadly weapons.
106. The primary indicator is Attempts to be deadly serious invariably result in unintended comedy.
107. Absence from those we love is self from self - a deadly banishment. William Shakespeare 
108. One of the most deadly animals in the world, the cobra[sentencedict.com], employs just such a device.
109. Her tranquil life was threatened by the coming of a man whom she regarded as her deadly enemy.
110. Ammunition, grenades, and demolition explosives went off in a deadly firework display.
111. Read in studio Oxfam is trying to recall seven thousand potentially deadly necklaces on sale in its shops.
112. In a flourish of biochemical altruism, they manufacture deadly molecules and then turn this lethal cocktail upon themselves.
113. Some mushrooms are edible while others, which look almost identical, contain deadly poisons.
114. But minutes later, this carjacking took a deadly new twist.
115. They help deplete the ozone layer, allowing ultraviolet rays to cause deadly skin cancers.
116. In later poems she is usually shown as treacherous and malicious, exerting a deadly and destructive power over men.
117. Global warming requires an ethical framework that classifies hitherto innocent actions as deadly.
118. It was now clear, however, that the position was becoming deadly serious.
119. Nations around the world are changing animal husbandry practices to block the potential spread of deadly animal disease to the dinner table.
120. These businessmen are crusty, rough-edged fellows trying to survive in deadly earnest competition with companies much bigger than theirs.
More similar words: deadline, badly, headline, idea, death, rapidly, dealer, deal in, deal out, allegedly, friendly, hardly any, supposedly, a big deal, deal with, repeatedly, reportedly, a good deal, a good deal of, upwardly mobile, the death penalty, head, lead, read, plead, leader, head up, head on, head for, thread.