What is the meaning of plodding?

noun

• Hard monotonous routine work.
  • synonyms: drudgery, grind, donkeywork
• The act of walking with a slow heavy gait.
  • usage: "I could recognize his plod anywhere"
  • synonyms: plod

verb

• Walk heavily and firmly, as when weary, or through mud.
  • usage: "Mules plodded in a circle around a grindstone"
  • synonyms: slog, footslog, plod, trudge, pad, tramp

adjective

• Of movement. ( slow and laborious)
  • usage: "leaden steps"
  • synonyms: leaden