Mr. Sherlock Holmes, who was usually very late in the mornings, save upon those not infrequent occasions when he was up all night, was seated at the breakfast table.
Arthur Conan Doyle, The Hound of Baskervilles
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Dictionary
Merriam-Webster
— seldom happening or occurring : RARE
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Macmillan
— not happening very often, or not doing something very often
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Usage
1 use of ‘infrequent’ in The Hound of the Baskervilles, by Arthur Conan Doyle