From un- + lexicographical. <span class="searchmatch">unlexicographical</span> (comparative more <span class="searchmatch">unlexicographical</span>, superlative most <span class="searchmatch">unlexicographical</span>) Not lexicographical....
lexicographic lexicographically metalexicographical nonlexicographical <span class="searchmatch">unlexicographical</span> lexical lexicographic — see lexicographic “lexicographical”, in OneLook...