con·ta·gious 
/kənˈteɪʤəs/ adjective
/kənˈteɪʤəs/ adjective [more contagious; most contagious] 1 : able to be passed from one person or animal to another by touching
▪ a contagious disease ▪ It's a highly contagious virus. — compare infectious 2 : having a sickness that can be passed to someone else by touching
▪ I have a cold and I'm still contagious. ▪ I'm sick, but the doctor says I'm not contagious. 3 : capable of being easily spread to others : causing other people to feel or act a similar way
▪ She has a contagious smile. [=her smile makes other people smile; her smile makes other people happy] ▪ contagious enthusiasm/laughter
▪ a contagious disease ▪ It's a highly contagious virus. — compare infectious
▪ I have a cold and I'm still contagious. ▪ I'm sick, but the doctor says I'm not contagious.
▪ She has a contagious smile. [=her smile makes other people smile; her smile makes other people happy] ▪ contagious enthusiasm/laughter
— con·ta·gious·ly adverb
▪ a contagiously enthusiastic person
▪ a contagiously enthusiastic person
— con·ta·gious·ness noun [noncount]
