Adjective
Without a decorative pattern.
Without a repeating pattern; random.
(of certain machinery for cutting shapes) That does not cut around a pattern.
(in computer science, of an object) That does not belong to a programming or markup pattern.
Source: en.wiktionary.orgThe C. oreganus group is popular within the venomous pet trade because of the high amount of color variation that can be found among the snakes, including amelanistic, albino, patternless and axanthic phenotypes. Source: Internet
The belly is generally patternless, but it is not related to striped or motley corns. Source: Internet