southernly adverb 2adjective 1forms 4 adverb2 •Southward, southerly.[…] the said river flowed in a southernly direction, and thence around said Dean's Island, and at or about the southwest end thereof the river turned […] — 1832 •In a Southern manner, in a way typical of a Southerner or of the South (the southern United States).“The good Lord seemed fond of sending us southerners many trials!” Christa murmured, […] “We were ever in sympathy with our more southernly sisters!” — 2012 adjective1 •Southerly, somewhat southern. formsmore Southernly · more southernly · most Southernly · most southernly