lumbering -- (the trade of cutting or preparing or selling timber)
Overview of verb lumber
The verb lumber has 2 senses
lumber, pound -- (move heavily or clumsily; "The heavy man lumbered across the room")
log, lumber -- (cut lumber, as in woods and forests)
Overview of adj lumbering
The adj lumbering has 1 sense
heavy, lumbering, ponderous -- (slow and laborious because of weight; "the heavy tread of tired troops"; "moved with a lumbering sag-bellied trot"; "ponderous prehistoric beasts"; "a ponderous yawn")