unusualness - uncommonness by virtue of being unusual

queerness, quirk, quirkiness, oddity, crotchet - a strange attitude or habit

eeriness, ghostliness - strangeness by virtue of being mysterious and inspiring fear

freakishness, abnormality - marked strangeness as a consequence of being abnormal

singularity - strangeness by virtue of being remarkable or unusual

bizarreness, outlandishness, weirdness - strikingly out of the ordinary

quaintness - strangeness as a consequence of being old fashioned; "some words in her dialect had a charming quaintness"

eccentricity - strange and unconventional behavior

quality - an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare

exoticism, exoticness, exotism - the quality of being exotic; "he loved the exoticism of Egypt"

alienage, alienism - the quality of being alien