humanly · adverb1
From human (adjective) + -ly (adverbial suffix). Piecewise doublet of humanely (in Middle English as humanly, when human and humane had not yet become different words).
humanly · adjective2
From human (noun) + -ly (adjectival suffix). Used once in Middle English, as humaynly, modelled on Middle Dutch menschelijc and meaning “characteristic of human nature”.
Etymology from Wiktionary, CC BY-SA 4.0.