From sky + -less. <span class="searchmatch">skyless</span> (not comparable) Without a sky....
From <span class="searchmatch">skyless</span> + -ness. <span class="searchmatch">skylessness</span> (uncountable) Absence of a sky....
sky island skyjack sky juice Skylab skylab skyland sky lantern skylark <span class="searchmatch">skyless</span> skylift skylight skylike skyline skyling skylit sky lounge skyly skymaiden...