Word meanings
Strong's dictionary
or מַדֻּעַ; from מָה and the passive participle of יָדַע; what (is) known?; i.e. (by implication) (adverbially) why?; how, wherefore, why.
Strong's Exhaustive Concordance (public domain)
Full lexicon entry (Brown-Driver-Briggs)
מַדּוּעַ 61 and מַדֻּעַ adv. wherefore?
Every occurrence
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Esther 3:3 מַדּ֙וּעַ֙ ma.Du.a' · Small word: why
Then the king's servants, that were in the king's gate, said unto Mordecai, Why transgressest thou the king's commandment?
American Standard Version (1901). Public domain.