| birefringent | (adjective) relating to or characterized by double refraction | - |
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| carefree | (adjective) cheerfully irresponsible | Synonyms: devil-may-care, freewheeling, happy-go-lucky, harum-scarum, slaphappy |
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| (adjective) free of trouble and worry and care | Synonyms: unworried |
| prefrontal | (adjective) anterior to a frontal structure | - |
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| refractile | (adjective) of or relating to or capable of refraction | Synonyms: refractive |
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| refractive | (adjective) of or relating to or capable of refraction | Synonyms: refractile |
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| (adjective) capable of changing the direction (of a light or sound wave) | Synonyms: deflective |
| refractory | (adjective) stubbornly resistant to authority or control | Synonyms: fractious, recalcitrant |
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| (adjective) temporarily unresponsive or not fully responsive to a process or stimulus | - |
| (adjective) not responding to treatment | Synonyms: stubborn |
| refreshed | (adjective) with restored energy | Synonyms: fresh, invigorated, reinvigorated |
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| refreshful | (adjective) imparting vitality and energy | Synonyms: bracing, brisk, fresh, refreshing, tonic |
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| refreshing | (adjective) imparting vitality and energy | Synonyms: bracing, brisk, fresh, refreshful, tonic |
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| (adjective) pleasantly new or different | Synonyms: novel |
| refrigerant | (adjective) causing cooling or freezing | Synonyms: refrigerating |
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| refrigerated | (adjective) made or kept cold by refrigeration | - |
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| refrigerating | (adjective) causing cooling or freezing | Synonyms: refrigerant |
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| unrefreshed | (adjective) not rested or refreshed | Synonyms: unrested |
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