From Longman Dictionary of Contemporary Englishill-informedˌill-inˈformed adjective knowing less than you should about a particular subjectill-informed about Some employers are ill-informed about education.
Examples from the Corpus
ill-informed• He's either a liar or he's incredibly ill-informed.• For someone who wants to be a journalist, she's remarkably ill-informed about current affairs.• All too often headmasters, teachers and parents are ill-informed about intended changes in primary curriculum programmes.• Resistance, ill-organized, ill-informed and largely based on non-quantifiable attachment to place, has little effect.• Writers such as Oscar Wilde were the target of ill-informed and often hostile criticism simply because they were gay.• Either way the notion is both ill-informed and ridiculous and it comes from paying too much attention to newspapers like the Guardian.• The ill-informed and uninvolved are easy victims to simplistic solutions.• By now, anyone ill-informed enough to imagine some elderly Miss Whiplash will have been put right.• That means Pascoe and a few dozen other ill-informed hysterics.• Without such a safeguard, a small group of ill-informed or zealous officers from either side could start a full-scale nuclear war.• Most of the comments came from ill-informed spectators. 