Synonyms for Southeastward (same or very similar meaning)
WordNet sense 1 (the compass point midway between south and east; at 135 degrees):
southeast, Se, sou'-eastWordNet sense 2 (situated in or facing or moving toward or coming from the south):
southWordNet sense 3 (in a southeastward direction):
southeastwardlyFrom the ODE community, based on WordNetadd/edit