| insufferable | (adjective) unbearably arrogant or conceited | - |
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| (adjective) too extreme to bear | Synonyms: unsufferable |
| insufficient | (adjective) of a quantity not able to fulfill a need or requirement | Synonyms: deficient |
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| sufferable | (adjective) capable of being borne though unpleasant | Synonyms: bearable, endurable, supportable |
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| suffering | (adjective) troubled by pain or loss | - |
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| (adjective) very unhappy; full of misery | Synonyms: miserable, wretched |
| sufficient | (adjective) of a quantity that can fulfill a need or requirement but without being abundant | - |
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| suffocating | (adjective) causing difficulty in breathing especially through lack of fresh air and presence of heat | Synonyms: choking, smothering, suffocative |
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| suffocative | (adjective) causing difficulty in breathing especially through lack of fresh air and presence of heat | Synonyms: choking, smothering, suffocating |
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| suffrutescent | (adjective) of a plant; having a woody base that does not die down each year | - |
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| suffusive | (adjective) spreading through | - |
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| unsufferable | (adjective) too extreme to bear | Synonyms: insufferable |
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