adjectiveBritish dialect, archaic
Of a period of time or (occasionally) distance: long, especially inordinately or tediously so. Of an event or action: taking place over a long period of time.
Late 18th century. From long + -ful.
adjectiveUS, British, Midlands English dialect
Full of longing or desire.
Mid 19th century; earliest use found in Donald Mitchell (1822–1908). From long + -ful.