| peregrine | (adjective) migratory | Synonyms: mobile, nomadic, roving, wandering |
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| regressive | (adjective) opposing progress; returning to a former less advanced state | - |
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| (adjective) (of taxes) adjusted so that the rate decreases as the amount of income increases | - |
| regretful | (adjective) feeling or expressing regret or sorrow or a sense of loss over something done or undone | Synonyms: bad, sorry |
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| regrettable | (adjective) deserving regret | Synonyms: too bad |
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| unregretful | (adjective) feeling no regret | Synonyms: unregretting |
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| unregretting | (adjective) feeling no regret | Synonyms: unregretful |
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