Adjective
Without an aisle.
Source: Webster's dictionaryIn the same region, Angoulême Cathedral is an aisless church of the Latin cross plan, more usual in France, but is also roofed with domes. Source: Internet
The simplest Romanesque churches are aisless halls with a projecting apse at the chancel end, or sometimes, particularly in England, a projecting rectangular chancel with a chancel arch that might be decorated with mouldings. Source: Internet