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Infrequent
Frequency Context
Use 'infrequent' for services or events where regular occurrences are expected but do not happen often. 
Negative Connotation
In some contexts, 'infrequent' may imply a negative aspect, suggesting that more frequency would be better. 
Neutral Cases
'Infrequent' can be neutral, without implying whether its rarity is good or bad. 