| defeasible | (adjective) capable of being annulled or voided or terminated | - |
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| feasible | (adjective) capable of being done with means at hand and circumstances as they are | Synonyms: executable, practicable, viable, workable |
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| indefeasible | (adjective) not liable to being annulled or voided or undone | - |
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| infeasible | (adjective) not capable of being carried out or put into practice | Synonyms: impracticable, unfeasible, unworkable |
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| unfeasible | (adjective) not capable of being carried out or put into practice | Synonyms: impracticable, infeasible, unworkable |
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