From <span class="searchmatch">overthoughtful</span> + -ness. <span class="searchmatch">overthoughtfulness</span> (uncountable) The quality of being <span class="searchmatch">overthoughtful</span>....
<span class="searchmatch">overthoughtful</span>, over thouʒtful, equivalent to over- + thoughtful. <span class="searchmatch">overthoughtful</span> (comparative more <span class="searchmatch">overthoughtful</span>, superlative most <span class="searchmatch">overthoughtful</span>)...