in a sad manner; unfortunately; regrettably
from 'sad' + '-ly', from Old English 'sæd' originally meaning 'satisfied, weary'
Interestingly, 'sad' originally meant 'satisfied' or 'full' - the meaning shifted to 'weary' and then to our modern sense of 'sorrowful'!
Complete word intelligence in one call. Free tier — 50 lookups/day.