From ultra- + extensive. <span class="searchmatch">ultraextensive</span> (not comparable) extremely extensive...
extensivity nonextensive overextensive subextensive superextensive <span class="searchmatch">ultraextensive</span> unextensive extend extense extent wide intensive extensive feminine...
ultraenthusiastic ultraevangelical ultraexcessive ultraexclusive ultraexpensive <span class="searchmatch">ultraextensive</span> ultrafabulous ultrafaint ultrafamiliar ultrafamous ultrafanatic ultrafanatical...