IPA: //ʌnˈsaɪtlinəs//
KK: /ʌnˈsaɪtliːnəs/
The condition of being unpleasant to look at or not attractive.
The unsightliness of the abandoned building made the neighborhood feel less welcoming.
Unsightliness → It is formed from "un-" (meaning not) and "sight" (from Old English "sīht", meaning the act of seeing or appearance) and "-liness" (meaning the quality of). The word "unsightliness" refers to the quality of not being sightly or attractive.
Think of 'not' ('un-') being combined with 'appearance' ('sight') and 'quality' ('-liness') — this helps you remember that unsightliness means something that is not attractive.