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infectious

/ˌɪnfˈɛkʃʌs/adjective3 syllables

Infectious means: easily spread.

Synonyms for infectious11

adjective, as in easily spread

catching, communicable, contagious, contractable, transmissible, transmittable, corrupting, contaminating

adjective, as in caused by infection or capable of causing infection

infective, septic, infected

Opposites of infectious

noninfectious

What does infectious mean?3

adjective

1

easily spread“fear is exceedingly infectious: children catch it from their elders”

2

caused by infection or capable of causing infection“viruses and other infective agents”

3

of or relating to infection“infectious hospital”

Definitions from the Open English WordNet, CC BY 4.0.

Infectious in a sentence

  • Influenza, measles, pox and chickenpox are infectious and contagious diseases.Muelisto
  • Infectious diseases are caused by prions, viruses, rickettsia, chlamydia, bacteria, pathogenic fungi and protozoa.Muelisto
  • William's enthusiasm and excitement were infectious, spreading to everyone around him.Amastan
  • Poliomyelitis, commonly shortened to polio, is an infectious disease which is highly contagious.Vanilla
  • William's charisma was infectious, spreading through the crowd like wildfire.Amastan
  • The infectious case was isolated from other patients.unknown
  • Dorottya's infectious smile brightens any room and captures the hearts of those around her.Amastan
  • Carlos is currently studying the biology of infectious diseases.Amastan

Sentences from Tatoeba, CC BY 2.0 FR, credited to their authors.