it means it has a border around it, or that is had well-defined frontier
The edges are uneven. Whatever is not perfectly circle.
Idaho's eastern border is defined by the rocky mountains.
Lesion appears to be ill defined and slightly hypodense on the non contrast and shows bright enhancement on the arterial phase scan
all the above
The ill-defined border between Texas and Mexico allowed for this type of confusion: while Mexicans believed the Rio Nueces to be the border between both countries, the Americans thought the Rio Grande was the actual border. This led to skirmishes, and eventually escalated into the Mexican-American War (1846-1848).
euthanasia.
The Thornton Affair, where American blood was spilled and became the perfect pretext to start the Mexican-American War, happened on a no man's land. According to Mexicans, the US-Mexico border was at the Nueces River, while Americans though of it as the Rio Grande. This ill-defined border resulted in such skirmishes and ultimately, war between both countries.
It is located more or less on the ill-defined border between the Mojave Desert and the Great Basin Desert.
Basically ill defined text and graphics
ill-defined, rough, loose, unfocused, imprecise
indefinite, indistinct, ill-defined