Definition of infectious in English:


Line breaks: in|fec¦tious
Pronunciation: /ɪnˈfɛkʃəs


  • 2Likely to spread or influence others in a rapid manner: a loud infectious laugh her enthusiasm is infectious
    More example sentences
    • The problem is once you fall for the guy with the infectious laugh or the girl that takes your breath away, you have to get them to notice you.
    • He had a wonderful sense of humour and an infectious, hearty laugh.
    • It does make you an energetic person, and one who has an infectious and personable manner.



More example sentences
  • At the same time, a European-derived painting style called Neo-Expressionism proved to be infectiously popular amongst the Art Institute students.
  • Though markedly different, both have strong elements of dance, which had the conductor almost pirouetting on the rostrum, thus coaxing infectiously springing rhythms from his colleagues.
  • Churchill's infectiously ebullient personality had served his government and his country well in the First World War as well as the Second.


More example sentences
  • An overwhelming majority of persons living with HIV infection do not get detected and remain unknowing of their potential illness and infectiousness to others.
  • If one takes these vibrios and cultivates them on nutritional media in the lab, or uses them to infect animal models, their infectiousness declines rapidly.
  • Perhaps this is why the film is best seen in a crowded theatre, where the infectiousness of cathartic emotion can have full play.


On the differences in meaning between infectious and contagious, see contagious (usage).

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