adverb
Etymology: Middle English, from stout + -ly
: in a stout manner:
a. : resolutely , stubbornly
stood stoutly for the interests of the colony — J.T.Adams
b. : solidly , strongly
the square ordered to be stoutly enclosed as protection in case of … attack — American Guide Series: Delaware
c. : vigorously
applauded him stoutly after each number — New Yorker