1 (wiktionary) 2 (de.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Verbs Nouns Adjectives/Adverbs Pronouns Prepositions Conjunctions
rare (Advanced search)

CEFR GNOT Temporal • frequency rarely

Glob1500 rare not common; not usual; not often ad.
NGSL3000 rare Not common or usual adj
NGSL3000 rarely In an infrequent manner adv

Tanaka6000 rare Tanaka6000 rarely

curare {n} (a substance containing the alkaloid D-tubocurarine) infrared {adj} (having the wavelength in the infrared) infrared {n} (infrared radiation) medium rare {adj} (cooked somewhat lightly) rare {adj} (cooked very lightly) rare {adj} (very uncommon) rare earth {n} (naturally occurring oxides of the lanthanide metals) rare earth element {n} (type of metal) rarefied {adj} (less dense than usual) rarely {adv} (not occurring at a regular interval) vorarephilia {n} (sexual fetish)

How did you come by those rare books ?	Wie sind Sie an diese seltenen Bücher gekommen?
She rarely , if ever , goes out of town .	Sie verlässt die Stadt selten, wenn überhaupt.
It is rare for him to get angry .	Es kommt selten vor, dass er wütend wird.