<span class="searchmatch">overmasterfulness</span> (uncountable) Excessive masterfulness....
masterful. IPA(key): /ˈəʊvəˈmæstɚfəl/ <span class="searchmatch">overmasterful</span> (comparative more <span class="searchmatch">overmasterful</span>, superlative most <span class="searchmatch">overmasterful</span>) (rare) Overly masterful; having excessive...