Willingly (adverb) — بإرادة طيبة: Readily and without being forced. Below are 6 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
Of one's own free will.
gladlyreadilyfreelyhappilyeagerly
In a pleasant or willing way.
In a happy, pleasant, and willing manner — doing something with bright positivity
GL usage: done willingly by one's own choice, not under pressure.