What is the meaning of lumbering?

noun

• The trade of cutting or preparing or selling timber.

verb

• Move heavily or clumsily.
  • usage: "The heavy man lumbered across the room"
  • synonyms: lumber, pound
• Cut lumber, as in woods and forests.
  • synonyms: log, lumber

adjective

• Slow and laborious because of weight.
  • usage: "the heavy tread of tired troops"; "moved with a lumbering sag-bellied trot"; "ponderous prehistoric beasts"; "a ponderous yawn"
  • synonyms: heavy, ponderous