In a way that is small, weak, or not as good as others.
This word can make people think of someone who is not very strong or big.
Examples:
He ran runtishly, not as fast as the others.
She sang runtishly, not as loud as the others.
The little dog barked runtishly at the big dogs.
He tried to lift the heavy box, but he could only do it runtishly.
The tiny mouse tried to roar runtishly like a lion.
She danced runtishly, not as well as the others.