The word piteously describes actions or expressions so sad or pathetic that they inspire sympathy or compassion, like a crying puppy in the rain that makes you want to take it home and care for it.
Rooted in the word pity, piteously describes actions or expressions that naturally spark sympathy and compassion from others. If someone is acting piteously, they might be pleading for help or comfort in a way that tugs at your heartstrings. For example, a remorseful child in trouble might piteously ask for forgiveness with tear-filled eyes, making a parent or teacher feel sorry enough to excuse their mischief.