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dea d le t|ter (dead letters ) N‑COUNT If you say that a law or agreement is a dead letter , you mean that it still exists but people ignore it. □  No one does anything about it and the law becomes a dead letter.

dead|line ◆◇◇ /de dla I n/ (deadlines ) N‑COUNT A deadline is a time or date before which a particular task must be finished or a particular thing must be done. □  We were not able to meet the deadline because of manufacturing delays. □ [+ for ] The deadline for submissions to the competition will be Easter Sunday.

dead|lock /de dlɒk/ (deadlocks ) N‑VAR If a dispute or series of negotiations reaches deadlock , neither side is willing to give in at all and no agreement can be made. □  They called for a compromise on all sides to break the deadlock in the world trade talks.

dead|locked /de dlɒkt/ ADJ [v-link ADJ ] If a dispute or series of negotiations is deadlocked , no agreement can be reached because neither side will give in at all. You can also say that the people involved are deadlocked . □ [+ over ] The peace talks have been deadlocked over the issue of human rights since August.

dead|ly /de dli/ (deadlier , deadliest )

1 ADJ If something is deadly , it is likely or able to cause someone's death, or has already caused someone's death. □  He was acquitted on charges of assault with a deadly weapon. □  …a deadly disease currently affecting dolphins. □  Passive smoking can be deadly too.

2 ADJ If you describe a person or their behaviour as deadly , you mean that they will do or say anything to get what they want, without caring about other people. [DISAPPROVAL ] □  The Duchess levelled a deadly look at Nikko.

3 ADV [ADV adj] You can use deadly to emphasize that something has a particular quality, especially an unpleasant or undesirable quality. [EMPHASIS ] □  Broadcast news was accurate and reliable but deadly dull.

4 ADJ [usu ADJ n] A deadly situation has unpleasant or dangerous consequences. □  …the deadly combination of low expectations and low achievement.

5 ADJ Deadly enemies or rivals fight or compete with each other in a very aggressive way. □  The two became deadly enemies.

dea d mea t N‑UNCOUNT If you say that someone is dead meat , you mean that they are in very serious trouble that may result in them being hurt or injured in some way. [INFORMAL , SPOKEN ]

dead|pan /de dpæn/ ADJ Deadpan humour is when you appear to be serious and are hiding the fact that you are joking or teasing someone. □  …her natural capacity for irony and deadpan humour.

dea d wei ght (dead weights )

1 N‑COUNT A dead weight is a load which is surprisingly heavy and difficult to lift.

2 N‑COUNT [usu sing] You can refer to something that makes change or progress difficult as a dead weight . □  …the dead weight of traditional policies.

dea d woo d N‑UNCOUNT People or things that have been used for a very long time and that are no longer considered to be useful can be referred to as dead wood . [DISAPPROVAL ] □  …the idea that historical linguistics is so much dead wood.

deaf /de f/ (deafer , deafest )

1 ADJ Someone who is deaf is unable to hear anything or is unable to hear very well. □  She is now profoundly deaf. ● N‑PLURAL The deaf are people who are deaf. This use could cause offence. □  Many regular TV programs are captioned for the deaf. ●  deaf|ness N‑UNCOUNT □  Because of her deafness she was hard to make conversation with.

2 ADJ If you say that someone is deaf to people's requests, arguments, or criticisms, you are criticizing them because they refuse to pay attention to them. [DISAPPROVAL ] □ [+ to ] The provincial assembly were deaf to all pleas for financial help.