illness//ˈɪlnəs//B1Frequency Level 7NeutralNounillnessSingularillnessesPlural1A disease or period of sickness affecting the body or mindShe missed work due to illness.2The state or condition of being in poor healthShe has been absent from work due to illness.SynonymsicknessdiseaseailmentmaladyAntonymhealthwellness
