The word "unweighted" means that something does not have any extra or special importance or value given to it. It is considered as having equal or unbiased weight or significance. Full definition
Because you're dealing with such small, unweighted samples of the electorate subsamples can't be taken seriously. (ukpollingreport.co.uk)
Second, exploratory factor analysis (EFA) was computed using unweighted least squares extraction and oblique (promin) rotation. (link.springer.com)
Heavy parental alcohol use (assessed at ages 4 and 12 years using binary alcohol measures) and adolescent offspring depressive symptoms — unweighted estimates. (journals.plos.org)