| susurrant | (adjective) making a low continuous indistinct sound | Synonyms: murmuring, whispering |
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| susurrous | (adjective) characterized by soft sounds | Synonyms: murmurous, rustling, soughing |
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| unusual | (adjective) not usual or common or ordinary | - |
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| (adjective) being definitely out of the ordinary and unexpected; slightly odd or even a bit weird | Synonyms: strange |
| (adjective) not commonly encountered | - |
| usual | (adjective) occurring or encountered or experienced or observed frequently or in accordance with regular practice or procedure | - |
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| (adjective) commonly encountered | Synonyms: common |
| usufructuary | (adjective) of or relating to the nature of a usufruct | - |
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| usurious | (adjective) greatly exceeding bounds of reason or moderation | Synonyms: exorbitant, extortionate, outrageous, steep, unconscionable |
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