Something that's infrequent doesn't happen very often. Your family might take infrequent trips to Disney World, traveling there every two or three years.

Things that are infrequent are rare or uncommon. You'd probably be glad to have infrequent run-ins with mean dogs or ugly insects, but disappointed to get infrequent phone calls from your best friend. The adjective infrequent comes from the prefix in, which here means "not," and frequent, or "often," which is rooted in the Latin word frequentem, "crowded or repeated."

Definitions of infrequent
  1. adjective
    not frequent; not occurring regularly or at short intervals
    infrequent outbursts of temper”
    recurring in scattered and irregular or unpredictable instances
    occurring from time to time
    recurring only at long intervals
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    coming at short intervals or habitually
    dominant, predominant, prevailing, prevalent, rife
    most frequent or common
    regular, steady
    relating to a person who does something regularly
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