southeasterly adjective 2adverb 1noun 1forms 3 adjective2 •situated in, or pointing to, the southeastThe people of the southeasterly clusters—concerning whom, however, but little is known—have a bad name as cannibals; and for that reason their hospitality is seldom taxed by the mariner. — 1847 •coming from the southeast adverb1 •From the southeast. noun1 •A strong wind or storm from the southeast. formssoutheasterlies · more southeasterly · most southeasterly