IPA: /ˈʃeɪmfəl/
KK: /ˈʃeɪmfəl/
Causing feelings of shame or disgrace; something that is considered wrong or embarrassing.
His behavior at the party was truly shameful and upset many of his friends.
Shameful → It is formed from "shame" (from Old English "sceamu", meaning a painful feeling of humiliation or distress caused by the consciousness of wrong or foolish behavior) and "-ful" (meaning full of). The word "shameful" means full of shame or deserving of shame.
Think of feeling 'full of' ('-ful') a painful feeling of humiliation ('shame') — that's why shameful means deserving of shame.