IPA: /ʌnˈdʒɛntli/
KK: /ʌnˈdʒɛntli/
In a manner that is not gentle; harshly or roughly.
He spoke to her ungently, making her feel uncomfortable.
Ungently → It is formed from "un-" (meaning not) and "gently" (from Old French *gentil*, meaning noble or well-born, which evolved to mean kind or mild). The word "ungently" means not in a gentle manner or harshly.
Think of 'not' ('un-') being combined with 'kind' or 'mild' ('gently') to remember that 'ungently' means to act in a harsh or rough way.