deadly
Able to eliminate
Deadly means capable of causing death: a deadly weapon, a deadly disease, a deadly poison.
It extends to anything extremely harmful or dangerous: deadly serious, deadly accurate.
In informal British usage, deadly can mean excellent or thrilling: That concert was deadly.
The adverb form means in a way suggesting death: deadly pale, deadly quiet.
Causing or capable of death
life-threatening · terminal · assassin · venomous · poisonous · bloodthirsty · brutal · vicious
Capable of causing harm
- poisonousCapable of causing death
- venomousProducing injected toxins
- noxiousHarmful, especially when inhaled
- virulentExtremely infectious or hostile
carcinogenic · contaminated · radioactive · pathogenic · pestilential · deleterious · corrosive · caustic
Apt to cause harm
- hazardousLikely to cause injury
- perilousFraught with danger
- treacherousDisloyal and dangerous
- menacingConveying threat or danger
threatening · risky · unsafe · precarious · high-risk · volatile · unpredictable · dire
Suggesting something bad approaches
- forebodingFearful anticipation of harm
- sinisterThreateningly suggestive of harm
- menacingConveying threat or danger
- portentousOminously significant
gloomy · inauspicious · eerie · spooky · grim · macabre · chilling · haunting
Conforming to fact
- preciseExactly correct, no error
- unerringConsistently accurate, unfailing
- unfailingNever failing or weakening
- pinpointLocate with exactness
exact · flawless · perfect · sure · certain · infallible · sharpshooting · marksmanship
Weighty and requiring attention
- extremeFurthest from moderate
- intenseExtreme in degree
- absoluteTotal, without qualification
- utterTo vocalize words
complete · total · profound · severe · fierce · implacable · relentless · uncompromising
Lacking edge or interest
- tediousBoring through length
- boringFailing to engage interest
- drearyDull and depressing
- monotonousUnchangingly dull
tiresome · wearisome · unexciting · lifeless · stale · flat · mind-numbing · soporific
lethal
Causing or capable of death
murderous · life-threatening · terminal · assassin · venomous · poisonous · bloodthirsty · brutal · vicious · savage
toxic
Capable of causing harm
- poisonousCapable of causing death
- venomousProducing injected toxins
- noxiousHarmful, especially when inhaled
virulent · carcinogenic · contaminated · radioactive · pathogenic · pestilential · deleterious · corrosive · caustic · baneful
dangerous
Apt to cause harm
- hazardousLikely to cause injury
- perilousFraught with danger
- treacherousDisloyal and dangerous
menacing · threatening · risky · unsafe · precarious · high-risk · volatile · unpredictable · dire · catastrophic
ominous
Suggesting something bad approaches
- forebodingFearful anticipation of harm
- sinisterThreateningly suggestive of harm
- menacingConveying threat or danger
portentous · gloomy · inauspicious · eerie · spooky · grim · macabre · chilling · haunting · dreadful
accurate
Conforming to fact
- preciseExactly correct, no error
- unerringConsistently accurate, unfailing
- unfailingNever failing or weakening
pinpoint · exact · flawless · perfect · sure · certain · infallible · sharpshooting · marksmanship · bullseye
serious
Weighty and requiring attention
utter · complete · total · profound · severe · fierce · implacable · relentless · uncompromising · formidable
dull
Lacking edge or interest
monotonous · tiresome · wearisome · unexciting · lifeless · stale · flat · mind-numbing · soporific · yawn-inducing
- Danger Levelsdanger, high risk, high-risk, low risk, critical
- toxicity levelstoxic, nontoxic, lethal, safe, hazardous
- weapon traitsaccuracy, damage, range, recoil, durability
- deathlydeceased, dying, expired, fatal, lethal
- slang approvalawesome, cool, rad, sweet, dope
- Irish Slangcraic, eejit, gobshite, banjaxed, slagging
deadlylife-giving
Sustaining or restoring vitality
healing · beneficial · healthful · curative · restorative
deadlyinaccurate
Not correct or precise
imprecise · poor · off-target · wide of the mark · ineffective
- dead endPassage without outlet
- drop deadExclamation of hostile dismissal
- dead bodyDeceased person's remains
- play deadPretend to be lifeless
- dead or aliveIn any vital state
- dropped deadDied suddenly, without warning
deaden, deadlock, dead, deadness, deadliest, deadliness, deadlier, deadly sin, deadly nightshade