understandingly

adverb2

1. •
   In an understanding manner; with empathy.

   • [T]he proprietor smiled understandingly. — 1965
2. •
   (no longer used) In a way that can be understood; intelligibly.

   • Garcias ab Horto writes of one whom he saw at Goa in the East Indies, that took ten drams of opium in three days; and yet consulto loquebatur, spake understandingly […] — 2001