Entry 2 senses Webster, 1913 Sickness · Sick·ness · IPA /ˈsɪknɪs/ 01 n. The quality or state of being sick or diseased; illness; sisease or malady. 1. The quality or state of being sick or diseased; illness; sisease or malady. “I do lament the sickness of the king.” — Shak. “Trust not too much your now resistless charms; Those, age or sickness soon or late disarms.” — Pope. 2. Nausea; qualmishness; as, sickness of stomach. Syn. Illness; disease; malady. See Illness.