Antonyms for the word "more reoccurring" are less frequent, infrequent, occasional, sporadic, rare, and isolated. When an occurrence is less frequent, it happens fewer times than usual or with a longer interval between each instance. An infrequent event is rare, irregular, or not happening very often. Occasional implies something that happens from time to time, but not on a regular basis. A sporadic occurrence is unpredictable, occurring at irregular intervals. A rare event is one that happens so seldom that it may be considered unusual. A single isolated event is one that stands alone without any history of recurrence.