The Collaborative International Dictionary
unpillared
noncolumned \noncolumned\ adj. (Arch.) not having columns. [Narrower terms: astylar; unpillared] columned
Syn: uncolumned.
Wiktionary
unpillared
a. Not pillared.
WordNet
unpillared
adj. lacking pillars
Usage examples of "unpillared".
He distrusted that unpillared ceiling and thought the whole place looked rather more primitive than Hasjarl's polished and leather-hung chambers.