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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151. Warnings of blowfish, which contain deadly poisons in their livers, came to mind.
152. His companion chuckled at the jest, but Gravelet, whose stage name was Blondin, was deadly serious.
153. He could hardly believe a young boy of no more than ten or eleven could be playing such a deadly game.
154. The vaccine brings hope to 1,300 young children struck down by the Hib form of deadly disease every year.
155. Many of the pimps, and some of the girls, have been forced into prostitution to feed a deadly heroin addiction.
156. Some fish boast armour so deadly that the predator dies within minutes of biting the spines.
157. Without education, we are in a horrible and deadly danger of taking educated people seriously. G.K. Chesterton 
158. The kinds of attack perpetrated by women seldom use deadly force.
159. You do sell red arsenic, nightshade, belladonna, and other deadly potions to those who are prepared to pay.
160. Large claymore-style mines were mounted on the surface for use against infantry,[http://sentencedict.com/deadly.html] frequently with deadly effect.
161. Suppose, for example, you regularly attend a weekly meeting which tends to be deadly dull.
162. Xavier Hicks, model student, was being charged with assault with a deadly weapon and possession of a concealed weapon.
163. One of the Seven Deadly Sins and the one most often fatal to the great ones.
164. These secretive facilities house the deadly legacies of the Cold War: nuclear weapons, radioactive waste and toxic chemicals.
165. I began to wish it wasn't Martinho who was my partner in this deadly game of doubles.
166. Jell-O is in many ways the edible version of an elemental archetype: Deadly beauty.
167. Tragically, it seems a deadly certainty that the region will dissolve into war.
168. He is still one of the most deadly aerial players in front of goal and has formed a good combination with Robert Fleck.
169. For those who are not yet infected with this deadly virus, remaining uninfected is very important, and very possible.
170. Drug abuse is a suicidal act. Men dig their own graves by being addicted to the deadly pleasures of psychedelic drugs. The drug addict lives to die for ecstasy and hallucination, and they cannot avoid a horrible fate. Dr T.P.Chia
171. The ad has been up around the country all spring, unanswered, and it has been deadly effective.
172. This she anointed with deadly drugs and placing it in a casket she sent her sons with it to the new bride.
173. It could be a major factor is reversing the deadly momentum of the population explosion.
174. Around it and over it the deadly din of battle roars.
175. Bee warned: Thousands of beehives are at risk after a deadly parasite was found in more colonies, experts warned yesterday.
176. Certain mixtures of drugs can be deadly, for example, alcohol plus barbiturates.
177. Then the alarm buzzed and they knew it was time to restart their deadly game.
178. The chronicle of the strikes, and the deadly bitterness they engendered, is a sorrowful one.
179. As with most weapons, depleted uranium is not as deadly as its proponents-or its critics-claim.
180. Bacilli were far more deadly than bullets in the battle for imperial survival.
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.