Understandingly adv. : In an understanding manner; intelligibly; with full knowledge or comprehension; intelligently; as, to vote upon a question understandingly; to act or judge understandingly.

Example:
What is the best way to tell your parents that you failed a course and they react calmly and Understandingly?

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Defination from the web:
understandingly in the Online Dictionary. Meaning of understandingly. Pronunciation of understandingly. Translations of understandingly. ... He looked at us understandingly, then took grandmother's hand and bent over it. My Antonia by Cather, Willa View in context ...