How to Say "infrequent" in Spanish
The Spanish word for “infrequent” is “raro” — B1 level. This is a very common word in everyday Spanish.

Examples
Es raro ver nevar en esta ciudad.
It's rare to see snow in this city.
Encontrar un diamante de este tamaño es extremadamente raro.
Finding a diamond of this size is extremely rare.
Rara vez salgo a cenar durante la semana.
I rarely go out to dinner during the week.
Placement is Key
Usually, 'raro' comes after the thing it describes, like in 'una flor rara' (a rare flower). However, in the very common phrase 'rara vez' (rarely), it comes first.
Strange vs. Infrequent
Mistake: “Mi profesor es raro. Solo da exámenes una vez al mes.”
Correction: This sentence could be confusing. Does it mean the professor is a weird person? Or that it's infrequent for him to give exams? For clarity, you could say: 'Es raro que mi profesor dé exámenes tan infrecuentemente' (It's strange that my professor gives exams so infrequently).
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