you can take iudex to mean judge. Because it's Latin for Judge. You don't want a thesaurus, you want an English-Latin dictionary (or Google translate).

"The correct answer is 'Contemporary'.  Key Points The exact antonym of the given word 'Obsolete' is 'Contemporary'.  Obsolete: no longer produced or used; out of date. (अब उत्पादन या उपयोग नहीं किया जाता है) Example: The disposal of old and obsolete machinery. ​Contemporary: belonging to or occurring in the present. (वर्तमान में होने या होने वाला) Example: The event was recorded by a contemporary historian. ​By reading the above definitions we find that the correct answer is 'Contemporary'.    Correct Answer: Contemporary.  Additional Information The meaning of the other options given in the question as follows:  Old: having lived for a long time; no longer young. (लंबे समय तक जीवित रहा) Outdated: out of date; obsolete. (अप्रचलित) Extinct: (of a species, family, or another group of animals or plants) having no living members; no longer in existence. (अब अस्तित्व में नहीं है)"