I. -lē, -li adverb
Etymology: Middle English gentilmanly, from gentilman + -ly (adverb suffix)
: in the manner of a gentleman
he was sitting gentlemanly up in the … taxi — Saul Bellow
II. adjective
Etymology: Middle English gentilmanly, from gentilman + -ly (adjective suffix)
: having the character of or characteristic of a gentleman in nature, behavior, or appearance
gentlemanly instincts