| susceptible | (adjective) (often followed by `of' or `to') yielding readily to or capable of | - |
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| (adjective) easily impressed emotionally | - |
| suspect | (adjective) not as expected | Synonyms: fishy, funny, shady, suspicious |
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| suspected | (adjective) believed likely | - |
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| suspended | (adjective) (of undissolved particles in a fluid) supported or kept from sinking or falling by buoyancy and without apparent attachment | - |
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| suspenseful | (adjective) (of a situation) characterized by or causing suspense | Synonyms: cliff-hanging, nail-biting, suspensive |
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| suspensive | (adjective) undecided or characterized by indecisiveness | - |
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| (adjective) (of a situation) characterized by or causing suspense | Synonyms: cliff-hanging, nail-biting, suspenseful |
| suspicious | (adjective) openly distrustful and unwilling to confide | Synonyms: leery, mistrustful, untrusting, wary |
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| (adjective) not as expected | Synonyms: fishy, funny, shady, suspect |
| sustainable | (adjective) capable of being sustained | - |
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| sustained | (adjective) maintained at length without interruption or weakening | - |
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| (adjective) (of an electric arc) continuous | Synonyms: free burning |
| sustentacular | (adjective) serving to sustain or support | - |
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| 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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