fretter

Example:The teacher assured the student of their exam success.

Definition:To free from doubt or worry by giving confidence; to make certain of or confirm.

Example:She tried to keep calm in the face of the emergency.

Definition:Not troubled or agitated, peaceful in mind, or free from agitation or disturbance.

Example:He relaxed in the warm, sunny weather.

Definition:To ease muscular tension or nervousness, become less alert, or become more relaxed.