The crossword solution for the term 'PREPARED FOR A FILLING' is 'NUMBED, ' which is a six-letter word. NUMBED is an adjective that describes a state of being without feeling or sensation, usually due to a local anesthetic. It is often used in dentistry when a patient is about to receive a filling, as the anesthetic numbs the area around the tooth so that the patient does not feel any pain during the procedure.