IPA: //ʌnˈfɔːlən//
KK: /ʌnˈfɔlən/
Not having fallen or not morally degraded.
The unfallen state of the garden was a sight to behold, untouched by time.
Unfallen → It is formed from "un-" (meaning not) and "fallen" (from Old English "feallan", meaning to fall). The word "unfallen" means not having fallen or remaining in a state of grace or purity.
Think of 'not' ('un-') having 'fallen' — this helps you remember that 'unfallen' means something that has not fallen or remains pure.