Adjective
1. rare ::
raro
2. uncommon ::
raro
3. unusual ::
insolito
4. exceptional ::
eccezionale
7. unaccustomed ::
insolito
8. unwonted ::
unwonted
9. isolated ::
isolato
10. scarce ::
scarso
12. sporadic ::
sporadico
13. irregular ::
irregolare
14. intermittent ::
intermittente
15. seldom ::
raramente
16. once in a blue moon ::
una volta in una luna blu