Worriedness is a state of being anxious, apprehensive or concerned about something. Some antonyms for the word include:
1. Calmness: The state of being relaxed and composed; not agitated or fretful.
2. Serenity: The state of being peaceful, untroubled, and tranquil.
3. Confidence: The feeling of belief in oneself, one's abilities and qualities.
4. Contentment: The state of being satisfied, happy, and fulfilled.
5. Ease: The freedom from trouble, difficulty, or pain; a relaxed and comfortable state.
6. Courage: The quality of being brave, fearless, and valiant.
7. Reassurance: Words or actions that provide comfort, security and peace of mind.