Infrequent means not occurring often; rare or uncommon. Therefore, the word that best expresses its meaning is rare.
Never ❌ — Means not at any time, which is stronger than “infrequent.”
Usual ❌ — Means normal or customary, which is the opposite of “infrequent.”
Rare ✅ — Means not common or occurring very seldom.
Sometimes ❌ — Means occasionally, but it does not express the meaning as precisely as “rare.”
