IPA: /ˌʌn.fɪlˈnɛr.ɪ.ti/
KK: /ʌnˌfɪlɪˈnɛrɪti/
The state of not being familiar with something; a lack of knowledge or experience about a person, place, or thing.
Her unfamiliarity with the city made it difficult for her to find her way around.
Unfamiliarity → It is formed from "un-" (meaning not) and "familiar" (from Latin *familiaris*, meaning of a household or well-known) and the suffix "-ity" (meaning the state or condition of). The word "unfamiliarity" means the state of not being well-known or not recognized.
Think of 'not' ('un-') being added to 'familiar' which means well-known, and the '-ity' indicating a state. This helps you remember that 'unfamiliarity' refers to the state of not being well-known.