Meaning : Feeling or expressing regret or sorrow or a sense of loss over something done or undone.
Example :
Felt regretful over his vanished youth.
Regretful over mistakes she had made.
He felt bad about breaking the vase.
Regretful ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Marathi. Regretful ka matlab kya hota hai?