IPA: //ʌnˈdʌld//
KK: /ʌnˈdʌld/
Not made dull; remaining sharp or keen in quality or perception.
The undulled knife sliced through the fruit effortlessly.
Undulled → It is formed from "un-" (meaning not) and "dulled" (from Old English "dull", meaning to make less sharp or less intense). The word "undulled" means not made dull or retaining sharpness or intensity.
Think of 'not' ('un-') making something 'dull' — so 'undulled' means something that remains sharp or intense.