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Seldom

/ˈseldəm/

Not happening often; rare.

Synonyms:

After that, he seldom opened his eyes."So seldom that any negligence or blunder appears!Comparatively speaking, I am very seldom there.

Derived from Middle English seldom, from the Old English seldan, meaning rarely or uncommon, related to the Old Norse sjaldan and Gothic seldom.

28 mentions per 1 million words

Often

Hint: Frequency according to COCA