From un- + dapper. <span class="searchmatch">undapper</span> (comparative more <span class="searchmatch">undapper</span>, superlative most <span class="searchmatch">undapper</span>) Not dapper....
alert. Quick; little and active. Dapper Dan dapperling dapperly dapperness <span class="searchmatch">undapper</span> neat, trim stylishly or neatly dressed quick and active Eppard, adprep...