周期的

(1)happening or recurring at regular intervals; "the periodic appearance of the seventeen-year locust"

(2)定期的に起こるか、繰り返されるさま

(3)recurring or reappearing from time to time; "periodic feelings of anxiety"

(4)繰り返されるか、時々再び現れるさま

(1)periodic feelings of anxiety

(2)不安の周期的な感情