The story
- Proto-West Germanic · inherited from*langasam“lengthy; long-lasting; vast; extensive”
- Old English · inherited fromlangsum“long; taking a long time; lasting a long time; long-enduring; long-suffering”
- Middle English · inherited fromlongsum
- English todaylongsome
From Middle English longsum, from Old English langsum (“long; taking a long time; lasting a long time; long-enduring; long-suffering”), from Proto-West Germanic *langasam (“lengthy; long-lasting; vast; extensive”), equivalent to long + -some.
Etymology from Wiktionary, CC BY-SA 4.0.