IPA: /ɪnˈdɪɡnli/
KK: /ɪnˈdɪɡnli/
In a manner that shows anger or annoyance at something perceived as unfair or unjust.
She indignly refused to accept the unfair treatment she received.
Indignly is derived from "indignus" (meaning unworthy or not deserving) and the adverbial suffix "-ly" (meaning in a manner of). The word "indignly" means in a manner that is unworthy or not deserving, often used to express a sense of injustice or offense.
Think of 'unworthy' ('indignus') to remember that 'indignly' means acting in a way that is not deserving or worthy.