occasional

(s) occurring from time to time
- took an occasional glass of wine
(s) occurring or appearing at usually irregular intervals
- episodic in his affections
- occasional headaches
episodic,
(s) occurring from time to time
- casual employment
- a casual correspondence with a former teacher
- an occasional worker
casual,
(s) recurring or reappearing from time to time
- periodic feelings of anxiety
periodic,

episodic casual periodic

occasions

occasionally