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| hardly ever; very seldom; very occasionally (Anglophile); once in a way; scarcely ever; as rare as dogs in space (VLZ_58); once in a blue moon (Andy) | |||
| very rare (классификация нежелательных побочных реакций по частоте развития paseal) | |||
| onсе in a blue moon (Сomandor) | |||
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| one in a thousand | |||
| rare as hen's teeth; rare as rocking horse shit | |||
| very scarce | |||
| very rare | |||
| scarce as ice water in hell | |||
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| exotic (Among the exotic kinds of nuts are the bambarra groundnut from tropical Africa, the Chile hazel... I. Havkin) | |||
| очень редко: 35 phrases in 9 subjects |
| General | 10 |
| Hydrology | 2 |
| Makarov | 15 |
| Mathematics | 1 |
| Medical | 1 |
| Nautical | 3 |
| Oceanography & oceanology | 1 |
| Programming | 1 |
| Proverb | 1 |