From un- + webbed. <span class="searchmatch">unwebbed</span> (not comparable) Not webbed....
unweb (third-person singular simple present unwebs, present participle <span class="searchmatch">unwebbing</span>, simple past and past participle <span class="searchmatch">unwebbed</span>) To undo a web or webbing....
From web + -less. webless (not comparable) Without a web; <span class="searchmatch">unwebbed</span>....