According to vocabulary.com, genuineness is a noun that means the state of being genuine. Genuine means to be authentic.
- Alene exhibited genuineness when she opened her home to the stranded couple.
- No one could question the genuineness of the marble countertop.
- Richard’s known to show genuineness while delivering his speeches.
- The texture of the paper contributed to the genuineness of the notes.
Some synonyms include effectiveness, efficacy, legitimacy, and realness.