<span class="searchmatch">unperforms</span> third-person singular simple present indicative of <span class="searchmatch">unperform</span>...
From un- + perform. <span class="searchmatch">unperform</span> (third-person singular simple present <span class="searchmatch">unperforms</span>, present participle <span class="searchmatch">unperforming</span>, simple past and past participle unperformed)...
<span class="searchmatch">unperforming</span> present participle and gerund of <span class="searchmatch">unperform</span> <span class="searchmatch">unperforming</span> (not comparable) That does not perform. 1841, George Chalmers, Daniel Defoe, The Novels...
From un- + performed. unperformed (not comparable) Not performed. not performed unperformed simple past and past participle of <span class="searchmatch">unperform</span>...