occasional
adj.
occurring from time to time
took an occasional glass of wine
adj.
occurring or appearing at usually irregular intervals
episodic in his affections|occasional headaches
Synonym: episodic
adj.
occurring on a temporary or irregular basis
casual employment|a casual correspondence with a former teacher|an occasional worker
Synonym: casual
adj.
recurring or reappearing from time to time
periodic feelings of anxiety
Synonym: periodic