IPA: //ˈpeɪn.fəl.nəs//
KK: /ˈpeɪn.fəl.nəs/
The condition of experiencing discomfort or suffering, often physically or emotionally.
The painfulness of the injury made it difficult for her to walk.
Painfulness → It is formed from "pain" (from Old French *peine*, meaning suffering or discomfort) and "-ful" (meaning full of) and "-ness" (meaning the state of being). The word "painfulness" means the state of being full of pain or suffering.
Think of being 'full of' ('-ful') 'suffering' ('pain') — that's why painfulness refers to the state of experiencing pain.