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Adjective: occasional  u'key-zhu-nul
  1. Not being done or happening often or much; happening from time to time
    "took an occasional glass of wine"
  2. Occurring or appearing at usually irregular intervals
    "occasional headaches";
    - episodic, episodical
  3. Not regular; working on an informal or ad hoc basis
    "an occasional worker";
    - casual
  4. Recurring or reappearing from time to time
    "occasional feelings of anxiety";
    - periodic

See also: infrequent, irregular, sporadic, unpredictable