pernicious

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++per·ni·cious /pəˈnɪʃəs $ pər-/ adjective formal  HARM/BE BAD FORvery harmful or evil, often in a way that you do not notice easily 很有害的〔通常不容易察觉〕 the pernicious effects of poverty 贫穷的危害性 the media’s pernicious influence 媒体的有害影响► see thesaurus at harmful —perniciously adverb

Examples from the Corpus

pernicious• In addition, Roycayrol and Cattan studied fundic biopsy specimens of 18 totally achlorhydric patients, 12 of whom had pernicious anaemia.• Gastrin levels may also be elevated by pernicious anemia. duodenal ulcers, and after a meal.• In 1937, she had felt she had had enough of the pernicious course of human history.• How can a struggling organization escape this pernicious cycle of perpetual reaction and strife?• the pernicious effects of advertising• a pernicious lie• And how did this pernicious self-image arise?• We are so easily led to pernicious solutions.• Unfortunately in 1971 I was not protected from that most pernicious word by those inverted commas.Origin pernicious (1500-1600) French pernicieux, from Latin perniciosus, from pernicies “destruction”, from nex “violent death”

per·ni·cious adjectiveChineseSyllable  

way a very in harmful often Corpus you evil, or that

pernicious
per‧ni‧cious /pəˈnɪʃəs $ pər-/ adjective formalvery harmful or evil, often in a way that you do not notice easily:
    the pernicious effects of poverty
    the media’s pernicious influence
—perniciously adverb
     

THESAURUS

   ▪ harmful causing physical harm – used especially about things that cause harm to your health, the environment etc: Smoking is harmful to your health. | drugs with harmful side-effects
   ▪ be bad for somebody/something to have a harmful effect on someone or something. This phrase is very commonly used in everyday English when saying that something is harmful: Everyone knows that too much alcohol is bad for you.
   ▪ damaging used about things that cause permanent physical harm, or that have a bad effect in other ways, for example on people’s opinion of someone: Acid rain has a damaging effect on trees and the soil. | The allegations were very damaging to his career. | Constant criticism is damaging to a child’s self-esteem.
   ▪ detrimental formal causing harm or having a bad effect on something: Employers are worried that the new laws will have a detrimental effect on their business. | chemicals that are detrimental to the environment | policies that have been detrimental to the interests of old people
   ▪ negative a negative effect is one that is bad and causes problems: The car tax had a negative effect on car sales. | the negative impact of the recession in the US
   ▪ hazardous hazardous substances are likely to be dangerous to people’s health and safety: Hazardous waste needs to be disposed of safely. | hazardous chemicals
   ▪ toxic toxic substances, smoke etc are poisonous: toxic waste | toxic fumes | Toxic chemicals spilled into the river.
   ▪ pernicious /pəˈnɪʃəs $ pər-/ formal used about something that has a gradual bad effect which is not easy to notice, especially on people’s morals, or on their health: the pernicious effects of violent video games | the pernicious effect of secondhand smoke

per·ni·ciousBrE /pəˈnɪʃəs/ 🔊NAmE /pərˈnɪʃəs/ 🔊 adjective (formal) having a very harmful effect on sb/sth, especially in a way that is gradual and not easily noticed 有害的，恶性的（尤指潜移默化地）