IPA: //ʌnˈfiːlɪŋnəs//
KK: /ʌnˈfilɪŋnəs/
The state of not showing any feelings or emotions; being emotionally cold or indifferent.
His unfeelingness made it hard for others to connect with him on a personal level.
Unfeelingness → It is formed from "un-" (meaning not) and "feeling" (from Old English "fēlan", meaning to perceive or sense) and "-ness" (meaning the state of being). The word describes the state of not having feelings or emotions.
Think of 'not' ('un-') having the ability to 'perceive' or 'sense' ('feeling') — that's why unfeelingness means the state of lacking feelings.