This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Third-person singular simple present indicative form of madden.

"Here Ms. Rubin puts her finger on something that maddens those of us who favor lower taxes and modest spending: the inherent bias in the way Washington debates are presented to the American people."

maddened    maddening    maddens   

anger    dun    bedevil    rag    crucify   

derange    unbalance   

enrage    derange    frenzy    anger   

Nevadan    gladden    hadden    sadden   

unbearable    terrify    infuriate    agonize    irritate