southwestwardly1
/ˌsaʊθˈwɛstwədli/adjective
Directed towards or situated in the south-west.
Origin
Late 18th century; earliest use found in Samuel Dunn (d. 1794), teacher of mathematics and navigation. From south + westwardly.
southwestwardly2
/ˌsaʊθˈwɛstwədli/adverb
In a south-westerly direction; towards the south-west.
Origin
Early 18th century. From southwestward + -ly, after westwardly.