Englishfor English speakers
effectively
Adverb
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If something is done effectively, it is done in a way that is effective.
undecidable
adjective
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(mathematics, computing theory) Incapable of being algorithmically decided in finite time. For example, a set of strings is undecidable if it is impossible to program a computer (even one with infinite memory) to determine whether or not specified strings are included.
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incapable of being algorithmically decided