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impracticable
[ˌɪ'mpræktɪkəbəɫ]
refloating the sunken ship proved impracticable because of its fragility
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infeasible
[ˌɪ'nfizəbəɫ]
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unfeasible
[ə'nfizəbəɫ]
a suggested reform that was unfeasible in the prevailing circumstances
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unworkable
[ə'nwɝkəbəɫ]